Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban hang » ngan hang
hang lai » hang tai, hang hai, hang loi
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
cam qua » cau qua, cac qua, cay qua
qua ban » cua ban, qua quan
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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: ((te sach) OR (toc sach)) ky nang ma hoa. hieu ve cam qua ban hang lai cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky nang ma hoa. hieu ve cam qua ban hang lai cua tre*.