Perhaps you should try some spelling variations:
lang thanh » dang thanh, tang thanh, lang thang
hoc chinh » hoan chinh, hoc sinh, hoc kinh
trinh ven » trinh van, trinh den, tinh ven
dung cong » dung trong
cong lang » cong vang, cong luong, cong quang
thanh ban » thanh san, thanh van, thanh bac
trinh ve » trinh he, trinh va, trinh vi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chinh sach - hanh ((trinh ve) or (trinh ven)) dung cong lang thanh ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chinh sach - hanh ((trinh ve) OR (trinh ven)) dung cong lang thanh ban.
• Adding a wildcard symbol may retrieve word variants: hoc chinh sach - hanh ((trinh ve) or (trinh ven)) dung cong lang thanh ban*.