Perhaps you should try some spelling variations:
hieu sach » chieu sach, hieu cach, dien sach
hanh tram » hanh tam, hanh trang, thanh tran
trong san » cong san, dong san, trong ca
doc hieu » toc thieu, hoc thieu, hoc hien
tram van » tran van, tam van, trang van
van dung » van dong, xay dung, tin dung
than cap » khan cap, thanh lap, thanh cac
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 - hanh tram van dung ((trong san) or (trong cac)) ((than cap) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - hanh tram van dung ((trong san) OR (trong cac)) ((than cap) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - hanh tram van dung ((trong san) or (trong cac)) ((than cap) or (toan tap))*.