Perhaps you should try some spelling variations:
dang cong » dung cong
doc hieu » hoc thieu, hoc hien
chat lua » chat cua, chat va, chat huu
lua dang » cua dang, lua sang, luan nang
cong tan » cong tac, cong san, cong thanh
tan vung » tay vung, dan vung, tan dung
vung van » vung va, dung van, vung ven

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)) sang - tinh chat lua dang cong tan vung van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) sang - tinh chat lua dang cong tan vung van*.