Perhaps you should try some spelling variations:
tieu sach » chieu sach, dien sach, te sach
dung cong » dung trong
tang van » dang van, hoang van, trong van
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan tap » toan ban
tang va » trang va, thang va, tang vat

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu sach - hanh ((tang va) OR (tang van)) dung cong tan toan tap~".
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - hanh ((tang va) OR (tang van)) dung cong tan toan tap*.