Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
dung cong » dung trong
ho chieu » hoc thieu, doi chieu, mot chieu
trang ca » trong ca, tang ca, trang ha
trang va » tran van, hang va
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: ((theo chieu) or (ho chieu)) xanh - hanh ((trang ca) OR (trang 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 ((trang ca) OR (trang 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 ((trang ca) OR (trang va)) dung cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (ho chieu)) xanh - hanh ((trang ca) OR (trang va)) dung cong tac toan cau*.