Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu sach » chieu sach, hieu cach, dien sach
manh tung » manh hung, thanh tung
cua nhung » va nhung
doc hieu » toc thieu, hoc thieu, hoc hien
tung cua » trung cua, tuong cua, dung cua
cong dan » cong san, cong tan, huong dan
than cao » toan cao, than sao, than vao
thai cao » tai cao, thoai cac, thuat cao
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 tung cua nhung cong dan ((((than cao) or (thai cao))) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - manh tung cua nhung cong dan ((((than cao) OR (thai cao))) OR (than cap)).
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - manh tung cua nhung cong dan ((((than cao) or (thai cao))) or (than cap))*.