Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cach thuc » anh thuc, cac thu
thuc cach » truoc cach, thuc hanh, tuc cac
khoa than » khoa luan, hoa thai, hoa tan
than hong » thanh hong, tran hong, phan hong
thu cach » thu canh, tu cach, tho cach
thi bach » thi bich, thi anh, thi binh
thi hanh » thi thanh

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: thu cach thuc ((((thi bach) OR (thi hanh))) OR (((thuc cach) OR (thuoc sach)))) khoa than hong~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu cach thuc ((((thi bach) OR (thi hanh))) or (((thuc cach) or (thuoc sach)))) khoa than hong~".
• Adding a wildcard symbol may retrieve word variants: thu cach thuc ((((thi bach) OR (thi hanh))) or (((thuc cach) or (thuoc sach)))) khoa than hong*.