Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, theo sach
thanh tung » thanh cong
tuan nhung » quan nhung, tuan hung, thuat nhung
nhung dung » phuong dung, ung dung, thong dung
hieu cach » hieu cac, chieu sach, hieu ca
tung tuan » trung tuan, hung tuan, quang tuan
dung dang » dung dan, dung dong, dung danh
thanh cau » thanh chau, nhanh cau, thanh ca
thanh mau » hanh mau, thanh san, thanh hai

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