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
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac
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 ((than cau) or (than cap))~.
• 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 ((than cau) OR (than cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sach - thanh ((tung va) OR (dung va)) nhung cong san ((than cau) or (than cap))".
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - thanh ((tung va) OR (dung va)) nhung cong san ((than cau) or (than cap))*.