Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, theo sach
thanh tung » thanh cong
dong huong » dong thuong, dong duong, cong huong
hieu cach » hieu cac, chieu sach, hieu ca
tung tuan » trung tuan, hung tuan, quang tuan
tuan dong » tuan duong, quan dong, luan dong
manh toan » thanh toan, anh tuan, tinh toan
dan toan » van toan, dan than, xuan toan

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 (hieu cach)) - thanh tung tuan dong huong ((dan toan) OR (manh toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (hieu cach)) - thanh tung tuan dong huong ((dan toan) or (manh toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) OR (hieu cach)) - thanh tung tuan dong huong ((dan toan) or (manh toan)) cau*.