Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
nang cac » nang cao, bang cac, hang cac
cac khoi » cac thoi, cac khoan, cach thoi
su sach » so sach, vu sach
xuc van » duc van, luc van, vuc van
hieu ve » hieu va
cua tre » cua te, cuu tre, cua triet
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 (thuoc sach)) ky nang cac khoi. ((hieu ve) or (hieu van)) cam xuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thuoc sach)) ky nang cac khoi. ((hieu ve) OR (hieu van)) cam xuc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuoc sach)) ky nang cac khoi. ((hieu ve) or (hieu van)) cam xuc van hanh vi cua tre*.