Perhaps you should try some spelling variations:
thanh trung » thanh tung
doc hieu » hoc thieu, hoc hien
trung va » truong va, trang va, trung ha
cong ban » cong bang, cong san, cong dan
cong tan » cong tac, cong san, cong thanh
danh dau » lanh dao, hang dau, danh tu
va hang » van hang, va nang, va lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (toc thieu)) xanh - thanh trung va hang ((cong ban) OR (cong tan)) danh dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) xanh - thanh trung va hang ((cong ban) OR (cong tan)) danh dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) or (toc thieu)) xanh - thanh trung va hang ((cong ban) OR (cong tan)) danh dau".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (toc thieu)) xanh - thanh trung va hang ((cong ban) OR (cong tan)) danh dau*.