Perhaps you should try some spelling variations:
chieu tach » chiet tach, chieu sach, chiu trach
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 tap » cuong tap, cong tac, tong tap
cong tan » cong tac, cong san, cong thanh
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 tach - ((anh quang) OR (anh quan)) doan phuong ((cong tap) OR (cong tan)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu tach - ((anh quang) or (anh quan)) doan phuong ((cong tap) OR (cong tan)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: doi chieu tach - ((anh quang) or (anh quan)) doan phuong ((cong tap) OR (cong tan)) toan cau*.