Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
trung cong » truong cong, trong cong, trung uong
doi chieu » doc hieu, doi chi, mot chieu
anh quang » anh xquang, nhanh quang, tinh quang
anh quan » anh tuan, ban quan, anh nhan
cong tac » cong ty
quan cau » quang cao, toan cau, quan ha

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 sach - ((anh quang) or (anh quan)) thanh trung cong tac quan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((anh quang) OR (anh quan)) thanh trung cong tac quan cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((anh quang) or (anh quan)) thanh trung cong tac quan cau*.