Perhaps you should try some spelling variations:
trung tuan » trung thanh, tran tuan, truong thanh
dang cong » dung cong
ho chieu » theo chieu, hoc thieu, doi chieu
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
doi chi » doi khi

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: ((ho chieu) OR (doi chi)) xanh - thanh ((trung tuan) OR (trung tam)) dang cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (doi chi)) xanh - thanh ((trung tuan) OR (trung tam)) dang cong tac toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (doi chi)) xanh - thanh ((trung tuan) OR (trung tam)) dang cong tac toan cau*.