Perhaps you should try some spelling variations:
tao khoi » thao khoa, lao khoa, tao boi
su sach » so sach, vu sach
hanh va » hang va, hanh vi
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
tao hoi » tao boi, tay hoi, thao hoc
ky sang » ky nang, ky dang, ky tang
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
va cua » va chua, via cua, ca cua
ve cac » va cac, vien cac

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: su sach ky sang ((tao hoi) OR (tao khoi)). hieu ve cac ((xuc va) OR (tuc va)) hanh va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky sang ((tao hoi) OR (tao khoi)). hieu ve cac ((xuc va) or (tuc va)) hanh va cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ky sang ((tao hoi) OR (tao khoi)). hieu ve cac ((xuc va) or (tuc va)) hanh va cua tre*.