Perhaps you should try some spelling variations:
trong nhung » thong nhung, trong hung, trong phung
chiet tach » chieu sach
doi chiet » doi chieu, doi chi, doi viet
anh quang » anh xquang, nhanh quang, tinh quang
anh quan » anh tuan, ban quan, anh nhan
cong tap » cuong tap, cong tan, tong tap
cong tac » cong ty
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 chiet tach - ((anh quang) or (anh quan)) trong nhung ((cong tap) or (cong tac)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chiet tach - ((anh quang) OR (anh quan)) trong nhung ((cong tap) OR (cong tac)) toan cau.
• Adding a wildcard symbol may retrieve word variants: doi chiet tach - ((anh quang) or (anh quan)) trong nhung ((cong tap) or (cong tac)) toan cau*.