These entries are queried from radb.net using whois, you can try my project getting these.
:AS135909 route: 103.88.120.0/22 descr: VNUHCM-VN origin: AS135909 mnt-by: MAINT-VN-VNNIC last-modified: 2022-02-22T09:01:44Z source: APNIC rpki-ov-state: valid route: 103.88.120.0/22 descr: DaiHocQuocGiaVNUHCM origin: AS135909 notify: tdm [at] htc-itc.com.vn mnt-by: MAINT-HANOITELECOM changed: ngadt [at] htc-itc.com.vn 20170331 source: NTTCOM rpki-ov-state: valid route: 103.88.120.0/22 descr: Proxy-registered route object origin: AS135909 notify: matthew.chan [at] hgc.com.hk mnt-by: MAINT-HGC-INTL changed: matthew.chan [at] hgc.com.hk 20170401 source: RADB last-modified: 2023-11-13T15:50:56Z rpki-ov-state: valid route: 103.88.120.0/23 descr: DaiHocQuocGiaVNUHCM origin: AS135909 notify: tdm [at] htc-itc.com.vn mnt-by: MAINT-HANOITELECOM changed: ngadt [at] htc-itc.com.vn 20170331 source: NTTCOM rpki-ov-state: valid route: 103.88.120.0/23 descr: VNUHCM-VN origin: AS135909 mnt-by: MAINT-VN-VNNIC last-modified: 2022-02-22T09:01:48Z source: APNIC rpki-ov-state: valid route: 103.88.120.0/23 descr: Proxy-registered route object origin: AS135909 notify: matthew.chan [at] hgc.com.hk mnt-by: MAINT-HGC-INTL changed: matthew.chan [at] hgc.com.hk 20170401 source: RADB last-modified: 2023-11-13T15:50:56Z rpki-ov-state: valid route: 103.88.120.0/24 descr: Proxy-registered route object origin: AS135909 notify: matthew.chan [at] hgc.com.hk mnt-by: MAINT-HGC-INTL changed: matthew.chan [at] hgc.com.hk 20170401 source: RADB last-modified: 2023-11-13T15:50:56Z rpki-ov-state: valid route: 103.88.120.0/24 descr: DaiHocQuocGiaVNUHCM origin: AS135909 notify: tdm [at] htc-itc.com.vn mnt-by: MAINT-HANOITELECOM changed: ngadt [at] htc-itc.com.vn 20170331 source: NTTCOM rpki-ov-state: valid route: 103.88.120.0/24 descr: VNUHCM-VN origin: AS135909 mnt-by: MAINT-VN-VNNIC last-modified: 2022-02-22T09:01:51Z source: APNIC rpki-ov-state: valid route: 103.88.121.0/24 descr: Proxy-registered route object origin: AS135909 notify: matthew.chan [at] hgc.com.hk mnt-by: MAINT-HGC-INTL changed: matthew.chan [at] hgc.com.hk 20170401 source: RADB last-modified: 2023-11-13T15:50:56Z rpki-ov-state: valid route: 103.88.121.0/24 descr: VNUHCM-VN origin: AS135909 mnt-by: MAINT-VN-VNNIC last-modified: 2022-02-22T09:01:54Z source: APNIC rpki-ov-state: valid route: 103.88.121.0/24 descr: DaiHocQuocGiaVNUHCM origin: AS135909 notify: tdm [at] htc-itc.com.vn mnt-by: MAINT-HANOITELECOM changed: ngadt [at] htc-itc.com.vn 20170331 source: NTTCOM rpki-ov-state: valid route: 103.88.122.0/23 descr: DaiHocQuocGiaVNUHCM origin: AS135909 notify: tdm [at] htc-itc.com.vn mnt-by: MAINT-HANOITELECOM changed: ngadt [at] htc-itc.com.vn 20170331 source: NTTCOM rpki-ov-state: valid route: 103.88.122.0/23 descr: Proxy-registered route object origin: AS135909 notify: matthew.chan [at] hgc.com.hk mnt-by: MAINT-HGC-INTL changed: matthew.chan [at] hgc.com.hk 20170401 source: RADB last-modified: 2023-11-13T15:50:56Z rpki-ov-state: valid route: 103.88.122.0/23 descr: VNUHCM-VN origin: AS135909 mnt-by: MAINT-VN-VNNIC last-modified: 2022-02-22T09:01:57Z source: APNIC rpki-ov-state: valid route: 103.88.122.0/24 descr: DaiHocQuocGiaVNUHCM origin: AS135909 notify: tdm [at] htc-itc.com.vn mnt-by: MAINT-HANOITELECOM changed: ngadt [at] htc-itc.com.vn 20170331 source: NTTCOM rpki-ov-state: valid route: 103.88.122.0/24 descr: Proxy-registered route object origin: AS135909 notify: matthew.chan [at] hgc.com.hk mnt-by: MAINT-HGC-INTL changed: matthew.chan [at] hgc.com.hk 20170401 source: RADB last-modified: 2023-11-13T15:50:56Z rpki-ov-state: valid route: 103.88.122.0/24 descr: VNUHCM-VN origin: AS135909 mnt-by: MAINT-VN-VNNIC last-modified: 2022-02-22T09:02:00Z source: APNIC rpki-ov-state: valid route: 103.88.123.0/24 descr: VNUHCM-VN origin: AS135909 mnt-by: MAINT-VN-VNNIC last-modified: 2022-02-22T09:02:04Z source: APNIC rpki-ov-state: valid route: 103.88.123.0/24 descr: DaiHocQuocGiaVNUHCM origin: AS135909 notify: tdm [at] htc-itc.com.vn mnt-by: MAINT-HANOITELECOM changed: ngadt [at] htc-itc.com.vn 20170331 source: NTTCOM rpki-ov-state: valid route: 103.88.123.0/24 descr: Proxy-registered route object origin: AS135909 notify: matthew.chan [at] hgc.com.hk mnt-by: MAINT-HGC-INTL changed: matthew.chan [at] hgc.com.hk 20170401 source: RADB last-modified: 2023-11-13T15:50:56Z rpki-ov-state: valid route6: 2001:df0:9b00::/48 descr: IPv6 prefix of VNU HCM 135909 origin: AS135909 notify: noc [at] netnam.vn mnt-by: MAINT-NETNAM-HCM changed: pop-hk [at] netnam.vn 20200425 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source