Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
quan hoang » luan hoan
hieu sach » hieu cach, dien sach, hieu cac
anh quang » anh xquang, anh quan, nhanh quang
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan tap » toan ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu sach) or (chieu sach)) - anh quang ((tran duc) or (quan hoang)) cong tan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sach) OR (chieu sach)) - anh quang ((tran duc) OR (quan hoang)) cong tan toan tap.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sach) or (chieu sach)) - anh quang ((tran duc) or (quan hoang)) cong tan toan tap*.