Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cao khoi » cac khoi, cao khai, co khoi
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
cua tre » cua te, cuu tre, cua triet
xuc va » tuc va, luc va, xac va
vi cua » vai cua, di cua

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) or (thu sach)) ky nang cao khoi. hieu va cham ((xuc va) or (duc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu sach)) ky nang cao khoi. hieu va cham ((xuc va) OR (duc va)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu sach)) ky nang cao khoi. hieu va cham ((xuc va) or (duc va)) hanh vi cua tre*.