Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hang lai » hang tai, hang hai, hang loi
lai cua » dai cua, hai cua, lai chau
qua ban » cua ban
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
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 hoi. hieu ve cam ((qua ban) OR (qua quan)) hang lai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky nang ma hoi. hieu ve cam ((qua ban) OR (qua quan)) hang lai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky nang ma hoi. hieu ve cam ((qua ban) OR (qua quan)) hang lai cua tre*.