Perhaps you should try some spelling variations:
thieu sach » chieu sach, hieu cach, theo sach
thien hach » thien thanh, hien hanh
thanh tran » thanh trang, thanh toan, thanh tra
van nhung » van nhuong, va nhung, van hung
xuong dan » huong dan, xuong san, tuong dan
tran van » luan van
tung dan » dung dan, huong dan, trung dai
toan tap » toan ban

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 (thien hach)) - thanh tran van nhung ((tung dan) or (xuong dan)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sach) OR (thien hach)) - thanh tran van nhung ((tung dan) OR (xuong dan)) toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) or (thien hach)) - thanh tran van nhung ((tung dan) or (xuong dan)) toan tap*.