Perhaps you should try some spelling variations:
thuyet thuat » thuyet thuc, thuyet thiet, thu thuat
thuat tach » thuat sach, thuat mach, thuat tac
dung cong » dung trong
trung va » truong va, trung ha, trung tam
trang va » tran van, hang va
cong dan » cong san, cong tan, huong dan
chan cap » khan cap, than cap, phan cac
cao cap » cao chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuyet thuat tach - thanh ((trung va) or (trang va)) dung cong dan ((chan cap) OR (cao cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuyet thuat tach - thanh ((trung va) OR (trang va)) dung cong dan ((chan cap) OR (cao cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuyet thuat tach - thanh ((trung va) or (trang va)) dung cong dan ((chan cap) OR (cao cap))".
• Adding a wildcard symbol may retrieve word variants: thuyet thuat tach - thanh ((trung va) or (trang va)) dung cong dan ((chan cap) OR (cao cap))*.