Perhaps you should try some spelling variations:
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
thanh tung » thanh cong
cong cong » cong dong, trong cong, dung cong
tung cua » trung cua, tuong cua, dung cua
cong tan » cong tac, cong san, cong thanh
can cau » van cau, ca cau, cac cau
ban cau » bang cau, ban can, van cau

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (thien hach)) - thanh tung cua cong cong tan ((can cau) OR (ban cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (thien hach)) - thanh tung cua cong cong tan ((can cau) or (ban cau))~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) OR (thien hach)) - thanh tung cua cong cong tan ((can cau) or (ban cau))*.