Perhaps you should try some spelling variations:
sang tao » hang tai
tao khoi » tao hoi, thao khoa, lao khoa
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hanh va » hanh vi
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ky sang » ky nang, ky dang, ky tang
xuc va » duc va, tuc va, luc 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 khoi. ((hieu ve) or (lieu va)) cam xuc va ((hanh va) OR (hang va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang tao khoi. ((hieu ve) OR (lieu va)) cam xuc va ((hanh va) OR (hang va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky sang tao khoi. ((hieu ve) or (lieu va)) cam xuc va ((hanh va) OR (hang va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky sang tao khoi. ((hieu ve) or (lieu va)) cam xuc va ((hanh va) OR (hang va)) cua tre*.