Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
hanh tran » hanh trang, thanh tran, hanh tram
doc hieu » toc thieu, hoc thieu, hoc hien
van dung » van dong, xay dung
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (doc hieu)) xanh - hanh tran ((van dung) OR (tin dung)) cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (doc hieu)) xanh - hanh tran ((van dung) OR (tin dung)) cong tac toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (doc hieu)) xanh - hanh tran ((van dung) OR (tin dung)) cong tac toan cao".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (doc hieu)) xanh - hanh tran ((van dung) OR (tin dung)) cong tac toan cao*.