Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
dung cong » dung trong
trang va » hang va
tran van » luan van
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan tap » toan ban
hieu ca » hieu cac, hieu cua, hieu va

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: hoc ((thieu sach) OR (hieu ca)) - hanh ((trang va) OR (tran van)) dung cong tan toan tap~.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (hieu ca)) - hanh ((trang va) or (tran van)) dung cong tan toan tap*.