Perhaps you should try some spelling variations:
tran phuong » trinh phuong, doan phuong, tai phuong
chieu sach » chinh sach, chieu sang, chieu xanh
tran phong » tran hong, van phong, tran hoang
anh quang » anh xquang, anh quan, nhanh quang
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.

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sach) or (chiet tach)) - anh quang ((tran phuong) OR (tran phong)) cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chiet tach)) - anh quang ((tran phuong) OR (tran phong)) cong tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) or (chiet tach)) - anh quang ((tran phuong) OR (tran phong)) cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (chiet tach)) - anh quang ((tran phuong) OR (tran phong)) cong tac toan cau*.