Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
cham cuc » cham cuu, pham cuc, pham chuc
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
cuc ban » cua ban, cac ban, cuu ban
ve cham » va cham, ve chat, vu cham
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (toc sach)) ky ((nang ma) or (lang xa)) hoi. hieu ve cham cuc ban hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky ((nang ma) OR (lang xa)) hoi. hieu ve cham cuc ban hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky ((nang ma) or (lang xa)) hoi. hieu ve cham cuc ban hanh vai cua tre*.