Perhaps you should try some spelling variations:
dung cong » dung trong
hoi hieu » hoi phieu, hoi tieu, moi hieu
tang tai » hang tai, dung tai, sang tao
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap
ho hieu » ho chieu, nho hieu, co hieu
tang ap » tang van, tang dan, tang ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho hieu) or (hoi hieu)) lang - thanh ((tang ap) OR (tang tai)) dung cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho hieu) OR (hoi hieu)) lang - thanh ((tang ap) OR (tang tai)) dung cong dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho hieu) or (hoi hieu)) lang - thanh ((tang ap) OR (tang tai)) dung cong dan than cau".
• Adding a wildcard symbol may retrieve word variants: ((ho hieu) or (hoi hieu)) lang - thanh ((tang ap) OR (tang tai)) dung cong dan than cau*.