Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
cau phuc » cau truc, chau phu, huu phuc
ban hanh » ban hang
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky nang x ho. hieu van ((cau phuc) or (cam xuc)) ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang x ho. hieu van ((cau phuc) OR (cam xuc)) ban hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang x ho. hieu van ((cau phuc) or (cam xuc)) ban hanh vi cua tre*.