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 va » truong va, trang va, trung ha
tran van » luan van
cong dan » cong san, cong tan, huong dan
chan cap » khan cap, cao cap, phan cac
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 va) or (tran van)) dung cong dan ((chan cap) OR (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuyet thiet tach - thanh ((trung va) OR (tran van)) dung cong dan ((chan cap) OR (than cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuyet thiet tach - thanh ((trung va) or (tran van)) dung cong dan ((chan cap) OR (than cap))".
• Adding a wildcard symbol may retrieve word variants: thuyet thiet tach - thanh ((trung va) or (tran van)) dung cong dan ((chan cap) OR (than cap))*.