Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu xanh » chieu sach, chieu sang, chieu tinh
doi chieu » doc hieu, doi chi, ho chieu
trung cua » truong cua, trung tuan, trung cap
than cua » nhan cua, ban cua, gian cua
thai cua » tai cuc, tri cua, dai cua
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu xanh - hanh ((((than cua) OR (thai cua))) OR (trung cua)) nhung cong tac toan cau~.
• Adding a wildcard symbol may retrieve word variants: doi chieu xanh - hanh ((((than cua) or (thai cua))) or (trung cua)) nhung cong tac toan cau*.