Perhaps you should try some spelling variations:
thuyet thiet » thuyet viet, thuat thiet, thuat nhiet
thiet tach » chiet tach, thien hach, thuat tach
nhung cong » dung cong, thong cong, hang cong
trang va » hang va
tran van » luan van
cong dan » cong san, cong tan, huong dan
dan van » dang van, doan van, dao van

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 - hanh ((trang va) or (tran van)) nhung cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuyet thiet tach - hanh ((trang va) OR (tran van)) nhung cong dan van ban.
• Adding a wildcard symbol may retrieve word variants: thuyet thiet tach - hanh ((trang va) or (tran van)) nhung cong dan van ban*.