Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
mot chieu » doi chieu, ho chieu
hang cong » dang cong, hang nong, bang cong
tinh van » trinh van, dinh van, tich van
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap
tinh va » tich va, trinh van, trinh vat

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

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