Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu sach » chieu sach, hieu cach, dien sach
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac
toan cao » toan tap
toan ban » van ban
tung va » trung va, tuong va, vung va

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 - thanh ((tung va) or (dung va)) nhung cong san ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - thanh ((tung va) OR (dung va)) nhung cong san ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - thanh ((tung va) or (dung va)) nhung cong san ((toan cao) or (toan ban))*.