Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
va tham » van tham, va cham, va thuat
va hanh » van hanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
te cac » tu cac, ve cac, te cao
soc va » hoc va, loc va, doc 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: te cac ((ky lang) OR (ky tang)) xa hoi. hieu ((va tham) or (va thanh)) soc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ((ky lang) OR (ky tang)) xa hoi. hieu ((va tham) OR (va thanh)) soc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ((ky lang) OR (ky tang)) xa hoi. hieu ((va tham) or (va thanh)) soc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te cac ((ky lang) OR (ky tang)) xa hoi. hieu ((va tham) or (va thanh)) soc va hanh vi cua tre*.