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

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 lang cong tan tho ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu tach) OR (thien thanh)) - thanh cong va lang cong tan tho ca.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu tach) or (thien thanh)) - thanh cong va lang cong tan tho ca*.