Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
hanh tran » hanh trang, thanh tran, hanh tram
dung cong » dung trong
manh toan » thanh toan, anh tuan, tinh toan
doc hieu » toc thieu, hoc thieu, hoc hien
tran van » luan van
toan ban » van ban

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 (theo tieu)) xanh - hanh tran van ((nhung cong) or (dung cong)) manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (theo tieu)) xanh - hanh tran van ((nhung cong) OR (dung cong)) manh toan ban.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (theo tieu)) xanh - hanh tran van ((nhung cong) or (dung cong)) manh toan ban*.