Perhaps you should try some spelling variations:
ban hanh » ban hang
te sach » toc sach
va hanh » van hanh, va thanh, dao hanh
hai cua » thai cua, dai cua, hoi cua
va danh » va dinh, va dan, dia danh
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
va cam » va cham, va cac, va cao
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky sang ma hoi. hieu va cam xuc ((((va hanh) or (ban hanh))) or (va danh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky sang ma hoi. hieu va cam xuc ((((va hanh) OR (ban hanh))) OR (va danh)) hai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky sang ma hoi. hieu va cam xuc ((((va hanh) or (ban hanh))) or (va danh)) hai cua tre*.