Perhaps you should try some spelling variations:
trong van » trong cac
nang cong » nang song, dang cong, bang cong
theo chu » theo chieu, cho chu, chao chu
chu xanh » chu manh, chieu xanh, chua xang
tang van » dang van, hoang van, tang luan
cong tac » cong ty
tac tran » tan tran, tac trai, tac tren
tran cao » toan cao, tran chau, trang cho

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chu xanh - hanh ((tang van) or (trong van)) nang cong tac tran cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu xanh - hanh ((tang van) OR (trong van)) nang cong tac tran cao.
• Adding a wildcard symbol may retrieve word variants: theo chu xanh - hanh ((tang van) or (trong van)) nang cong tac tran cao*.