Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
quang tran » quang tuan, quang trung, quang thanh
hieu cach » hieu cac, hieu ca, biet cach
tran hung » tran hong, tran quang, tran hoang
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
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: doc ((hieu cach) OR (chieu sach)) - nhanh quang tran hung ((cong tan) or (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu cach) OR (chieu sach)) - nhanh quang tran hung ((cong tan) OR (cong san)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu cach) OR (chieu sach)) - nhanh quang tran hung ((cong tan) or (cong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu cach) OR (chieu sach)) - nhanh quang tran hung ((cong tan) or (cong san)) toan cao*.