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 dan » cong san, cong tan, huong dan
cong va » dong va, cong ha, cong tac
va lang » va nang, hoa lang
dan tho » dan thi, can tho, dai 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 dan 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 dan tho ca.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu tach) or (thien thanh)) - thanh cong va lang cong dan tho ca*.