Perhaps you should try some spelling variations:
thuyet viet » thuyet dieu, truyen viet, thuyet kiem
viet tach » viet sach, viet tech, viet thanh
dung cong » dung trong
trung ha » trung hoc, trung tam, trung cap
trang va » tran van, hang va
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuyet viet tach - thanh ((trung ha) or (trang va)) dung cong dan than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuyet viet tach - thanh ((trung ha) OR (trang va)) dung cong dan than cap.
• Adding a wildcard symbol may retrieve word variants: thuyet viet tach - thanh ((trung ha) or (trang va)) dung cong dan than cap*.