Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
tu sach » thu sach, su sach, te sach
lai cua » dai cua, hai cua, lai chau
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
tao hoi » tao khoi, tay hoi, thao hoc
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
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.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky sang ((tao hoi) OR (tao boi)). hieu ve cam xuc ((va hanh) or (van thanh)) lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang ((tao hoi) OR (tao boi)). hieu ve cam xuc ((va hanh) OR (van thanh)) lai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang ((tao hoi) OR (tao boi)). hieu ve cam xuc ((va hanh) or (van thanh)) lai cua tre*".