Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
tu cach » tu cac
van hoe » van hoa, van hoc, van hieu
xuc van » duc van, luc van, xuc ban
nam xuc » cam xuc, nam xua, nam thuc
cua tre » cua te, cuu tre, cua triet
van hoi » van hoa, van hoc, van loi
ky lang » ky nang, ky dang, ky tang
so sach » so sanh, bo sach, co sach
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: ((tu cach) or (so sach)) ky lang ((van hoi) OR (van hoe)). hieu van nam xuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (so sach)) ky lang ((van hoi) OR (van hoe)). hieu van nam xuc van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (so sach)) ky lang ((van hoi) OR (van hoe)). hieu van nam xuc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (so sach)) ky lang ((van hoi) OR (van hoe)). hieu van nam xuc van hanh vi cua tre*.