Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tranh van » tran van, trinh van, thanh van
van nhung » van nhuong, va nhung, van hung
chi xanh » chi anh, chi danh, chi hanh
cong tac » cong ty
doi chi » doi khi
chai tu » cai tu, choi tu, chay tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi xanh - canh tranh van nhung cong tac ((chai tu) or (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi xanh - canh tranh van nhung cong tac ((chai tu) OR (phan tu)).
• Adding a wildcard symbol may retrieve word variants: doi chi xanh - canh tranh van nhung cong tac ((chai tu) or (phan tu))*.