Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
hoc thien » hoc hien, hoc thieu, hoc thiet
cong chuc » cong thuc, cong cu, cong cua
hang cong » dang cong, hang nong, bang cong
cong cau » cong cu, thong cau, cong tac
cong van » cong vang, cong san, song van
van than » van thanh, van thang, van tuan
than cao » toan cao, thai cao, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thien hach - thanh ((cong cau) or (cong chuc)) hang cong van than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - thanh ((cong cau) OR (cong chuc)) hang cong van than cao.
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - thanh ((cong cau) or (cong chuc)) hang cong van than cao*.