Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung cong » dung cong, thong cong, hang cong
hieu sach » chieu sach, hieu cach, dien sach
trung cao » truong cao, trung cap, trung co
dang cong » dung 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 - thanh trung cao ((nhung cong) or (dang cong)) dan ((than cao) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - thanh trung cao ((nhung cong) OR (dang cong)) dan ((than cao) OR (than cap)).
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - thanh trung cao ((nhung cong) or (dang cong)) dan ((than cao) or (than cap))*.