Perhaps you should try some spelling variations:
ky lang » ky dang, ky tang, tay lang
va cham » va tham
va chat » van chat, va phat, cao chat
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
soc va » hoc va, loc va, doc va
vi cua » vai cua, di cua
vien » viet, bien

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

• Performing a fuzzy search may retrieve terms with similar spellings: vien bach ((ky lang) or (ky nang)) xa hoi. hieu ((va cham) OR (va chat)) soc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vien bach ((ky lang) OR (ky nang)) xa hoi. hieu ((va cham) OR (va chat)) soc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vien bach ((ky lang) or (ky nang)) xa hoi. hieu ((va cham) OR (va chat)) soc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: vien bach ((ky lang) or (ky nang)) xa hoi. hieu ((va cham) OR (va chat)) soc va hanh vi cua tre*.