Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
trung cua » truong cua, trung tuan, trung cap
trong tac » trong cac, tuong tac, trong tan
ho chieu » theo chieu, hoc thieu, mot chieu
tung cua » tuong cua, dung cua, tang cua
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: ((doi chieu) or (ho chieu)) tinh - thanh ((tung cua) or (trung cua)) dung trong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (ho chieu)) tinh - thanh ((tung cua) OR (trung cua)) dung trong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (ho chieu)) tinh - thanh ((tung cua) or (trung cua)) dung trong tac toan cau*.