Perhaps you should try some spelling variations:
sang tao » hang tai
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
tao hoi » tao khoi, tao boi, tay hoi
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
xuc va » tuc va, luc va, xac va

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

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