Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
tran hoang » tran hong, quan hoang, tran quang
anh quang » anh xquang, anh quan, nhanh quang
tran hung » tran hong, tran quang, tran huu
hieu cac » hieu luc, hieu va, hieu van
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan ban » van 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 ((chieu sach) or (hieu cac)) - anh quang ((tran hung) or (tran hoang)) cong tan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sach) OR (hieu cac)) - anh quang ((tran hung) OR (tran hoang)) cong tan toan ban.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sach) or (hieu cac)) - anh quang ((tran hung) or (tran hoang)) cong tan toan ban*.