Perhaps you should try some spelling variations:
hieu sach » chieu sach, hieu cach, dien sach
hanh tram » hanh tam, hanh trang, thanh tran
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
tram van » tran van, tam van, trang van
khan cap » khan ap, than cap, khoan cam
thanh ca » thanh cha, thanh cac, thanh ha

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 ((hang cong) or (bang cong)) dan ((khan cap) or (thanh ca))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - hanh tram van ((hang cong) OR (bang cong)) dan ((khan cap) OR (thanh ca)).
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - hanh tram van ((hang cong) or (bang cong)) dan ((khan cap) or (thanh ca))*.