In February 2022, due to numerous COVID-19 cases within the Vietnam U23 squad, Thanh Nhân and 9 other players were additionally called up to the team for the 2022 AFF U-23 Championship in Cambodia. He played two matches in total during the tournament, including the 1–0 against Thailand in group stage and the semi-final victory against Timor Leste, in which he scored the winning penalty to help U23 Vietnam won 5–3 in the penalty shoot-out.[4] His teammates secured the title by defeating Thailand 1–0 again in the final.[5]
In June 2022, Gong Oh-kyun named Thanh Nhân in the Vietnam U23's squad for the 2022 AFC U-23 Asian Cup in Uzbekistan.[6] Thanh Nhân played in the 3 matches during the tournament and had an assist in the group stage match against Malaysia with a cross to help Nhâm Mạnh Dũng headed the opener.[2]
Thanh Nhân made his senior level debut on 25 September 2022 against Singapore in the 2022 VFF Tri-Nations Series. He substituted Phan Tuấn Tài in the 46th minute and scored his first international goal just 5 minutes after.[7] The match ended in a 4–0 win for Vietnam.[8]
