Perhaps you should try some spelling variations:
thien hach » thien thanh, hien hanh
thanh tung » thanh cong
hoc thien » hoc hien, hoc thieu, hoc thiet
cong sang » cong lang, cong vang, cong bang
thanh cap » thanh lap, hanh cap, than cap
cong san » cong tac
tung va » trung va, tuong va, dung va

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 tung va nhung ((cong san) or (cong sang)) thanh cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thien hach - thanh tung va nhung ((cong san) OR (cong sang)) thanh cap.
• Adding a wildcard symbol may retrieve word variants: hoc thien hach - thanh tung va nhung ((cong san) or (cong sang)) thanh cap*.