Perhaps you should try some spelling variations:
hanh truong » hanh trong, anh truong, manh truong
doi chieu » doc hieu, doi chi, mot chieu
hua khong » hoa khong, cua khong, hoac khong
ho chieu » theo chieu, hoc thieu, mot chieu
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » 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: ((ho chieu) or (doi chieu)) xanh - hanh truong ((cua cong) or (hua khong)) cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (doi chieu)) xanh - hanh truong ((cua cong) OR (hua khong)) cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chieu)) xanh - hanh truong ((cua cong) or (hua khong)) cong tac toan cau*.