Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
trong manh » trong minh, trong anh, trong mach
manh toan » thanh toan, anh tuan, tinh toan
ho chieu » hoc thieu, doi chieu, mot chieu
hang tai » hang va, dung tai
toan cau » toan cao, toan ban, toan tap
hang ca » hang va, nang cao, hang dau

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: ((theo chieu) OR (ho chieu)) tinh - tranh ((hang ca) OR (hang tai)) dung trong manh toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) OR (ho chieu)) tinh - tranh ((hang ca) or (hang tai)) dung trong manh toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) OR (ho chieu)) tinh - tranh ((hang ca) or (hang tai)) dung trong manh toan cau*.