Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
tran nhung » tranh nhung, tren nhung, trinh nhung
doi chieu » doc hieu, doi chi, mot chieu
anh quang » anh xquang, anh quan, nhanh quang
tran hung » tran hong, tran quang, tran hoang
cong hach » cong sach, cong thanh, cong khanh
hach toan » thanh toan, manh toan
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 sach - anh quang ((tran nhung) OR (tran hung)) cong hach toan cao~.
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - anh quang ((tran nhung) or (tran hung)) cong hach toan cao*.