Perhaps you should try some spelling variations:
dung cong » dung trong
doc hieu » hoc thieu, hoc hien
cong dap » cong dan, cong lap, cong da
dap dung » ap dung, dan dung, dap ung
cong tan » cong tac, cong san, cong thanh
tan van » tran van, tang van, luan van
van tap » van tai, van tan, han tap

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)) tinh - thanh cong dap dung cong tan van tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) tinh - thanh cong dap dung cong tan van tap.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (toc thieu)) tinh - thanh cong dap dung cong tan van tap*.