Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, cua triet
xuc van » duc van, luc van, xuc ban
vu sach » vu bach, su sach, vu khach
ky dang » ky nang, ky danh
xay hoi » xa hoi, cay phoi, gay thoi
tay hoi » tay ho, tao hoi, tay thai
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua
va cam » va cham, va cac, va cao

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

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