Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
hanh hang » thanh hang, hanh han, hanh mang
hang hang » nang hang, cang thang, hung thang
dung cong » dung trong
ho chieu » hoc thieu, doi chieu, mot chieu
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
va dung » van dung, va duong, vat dung

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 (ho chieu)) xanh - ((hanh hang) OR (hang hang)) va dung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (ho chieu)) xanh - ((hanh hang) OR (hang hang)) va dung cong tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (ho chieu)) xanh - ((hanh hang) OR (hang hang)) va dung cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (ho chieu)) xanh - ((hanh hang) OR (hang hang)) va dung cong tac toan cau*.