Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, mot chieu
tran tuan » tran xuan, tran quang, tran thanh
dang cong » dung cong
ho chieu » theo chieu, hoc thieu, mot chieu
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: ((doi chieu) OR (ho chieu)) xanh - thanh ((tran tuan) or (trung tam)) dang cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (ho chieu)) xanh - thanh ((tran tuan) OR (trung tam)) dang cong tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chieu) OR (ho chieu)) xanh - thanh ((tran tuan) or (trung tam)) dang cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) OR (ho chieu)) xanh - thanh ((tran tuan) or (trung tam)) dang cong tac toan cau*.