Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
manh trung » manh tung, thanh trung, manh hung
hieu sach » chieu sach, hieu cach, dien sach
trung cua » truong cua, trung tuan, trung cap
hang cong » dang cong, hang nong, bang cong
doc hieu » toc thieu, hoc thieu, hoc hien
than cao » toan cao, thai cao, than sao
than cap » khan cap, thanh lap, thanh cac

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 - manh trung cua ((nhung cong) OR (hang cong)) dan ((than cao) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - manh trung cua ((nhung cong) OR (hang cong)) dan ((than cao) OR (than cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sach - manh trung cua ((nhung cong) OR (hang cong)) dan ((than cao) or (than cap))".
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - manh trung cua ((nhung cong) OR (hang cong)) dan ((than cao) or (than cap))*.