Perhaps you should try some spelling variations:
anh quang » anh xquang, anh quan, nhanh quang
tran hung » tran hong, tran hoang, tran huu
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
co sach » cuon sach, hoc sach
bo sach » hoc sach

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 ((co sach) OR (bo sach)) - anh quang ((tran hung) OR (tran quang)) cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((co sach) OR (bo sach)) - anh quang ((tran hung) or (tran quang)) cong tac toan cau~".
• Adding a wildcard symbol may retrieve word variants: doi ((co sach) OR (bo sach)) - anh quang ((tran hung) or (tran quang)) cong tac toan cau*.