Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thieu tach » thien hach, chiet tach, chieu sach
dang cong » dung cong
cong tan » cong tac, cong san, cong thanh
cong va » dong va, cong ha, cong tac
va dang » van dang, va nang, va lang
tan tho » tap tho, can tho, dan tho
tho cac » cho cac, tho ca, thong cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu tach) or (thien thanh)) - thanh cong va dang cong tan tho cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu tach) OR (thien thanh)) - thanh cong va dang cong tan tho cac.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu tach) or (thien thanh)) - thanh cong va dang cong tan tho cac*.