Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, theo sach
thanh tung » thanh cong
hieu cach » hieu cac, chieu sach, hieu ca
qua nhung » quan nhung, cua nhung, qua chung
thanh cau » thanh chau, thanh mau, nhanh cau
tung qua » dung qua, tuong quan, trung quan
cong ban » cong bang, cong san, cong dan
cong tan » cong tac, cong san, cong thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sach) or (hieu cach)) - thanh tung qua nhung ((cong ban) or (cong tan)) thanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (hieu cach)) - thanh tung qua nhung ((cong ban) OR (cong tan)) thanh cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (hieu cach)) - thanh tung qua nhung ((cong ban) or (cong tan)) thanh cau*.