Perhaps you should try some spelling variations:
thuyet thiet » thuyet viet, thuat thiet, thuat nhiet
thiet tach » chiet tach, thien hach, thuat tach
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 thiet 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 thiet tach - thanh ((trung ha) OR (trang va)) dung cong dan than cap.
• Adding a wildcard symbol may retrieve word variants: thuyet thiet tach - thanh ((trung ha) or (trang va)) dung cong dan than cap*.