Perhaps you should try some spelling variations:
trong nhung » thong nhung, trong hung, trong phung
anh quang » anh xquang, nhanh quang, tinh quang
chi sach » chinh sach, chieu sach, co sach
anh quan » anh tuan, ban quan, anh nhan
tong tap » tuong tac, trong tan, tong hop
cong tac » cong ty
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.

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi sach - ((anh quang) or (anh quan)) trong nhung ((tong tap) or (cong tac)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sach - ((anh quang) OR (anh quan)) trong nhung ((tong tap) OR (cong tac)) toan cau.
• Adding a wildcard symbol may retrieve word variants: doi chi sach - ((anh quang) or (anh quan)) trong nhung ((tong tap) or (cong tac)) toan cau*.