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, trang va, trung ha
tran van » luan van
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan cap » khan cap, than cap, cao cap

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 (tran van)) dung cong dan chan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuyet thuat tach - thanh ((trung va) OR (tran van)) dung cong dan chan cap.
• Adding a wildcard symbol may retrieve word variants: thuyet thuat tach - thanh ((trung va) or (tran van)) dung cong dan chan cap*.