Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
doc hieu » toc thieu, hoc hien
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau
cong va » dong va, cong tac, luong va
cong ha » cong hoa, dong ha, cong tac

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 (hoc thieu)) xanh - thanh ((cong va) or (cong ha)) dung cong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc thieu)) xanh - thanh ((cong va) OR (cong ha)) dung cong dan chan cau.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (hoc thieu)) xanh - thanh ((cong va) or (cong ha)) dung cong dan chan cau*.