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