Perhaps you should try some spelling variations:
hieu sach » chieu sach, hieu cach, dien sach
dong cong » duong cong, dung cong, dang cong
van khang » van khanh, van thanh, van quang
doc hieu » toc thieu, hoc thieu, hoc hien
mang cua » manh cua, dung cua, cong cua
dan than » dan chan, ban than, van than
ban cua » ban quan

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 ((mang cua) or (ban cua)) dong cong ((dan than) or (van khang)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - hanh ((mang cua) OR (ban cua)) dong cong ((dan than) OR (van khang)) ban.
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - hanh ((mang cua) or (ban cua)) dong cong ((dan than) or (van khang)) ban*.