Perhaps you should try some spelling variations:
thien van » thi van
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
thai son » thai den, thai do, thai hoc
hieu van » hieu va, lieu va, hieu ve
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
son va » song va, son la, lon va
te cao » te bao
vi cua » vai cua, di cua
te cac » tu cac, ve cac, de cac

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 van) OR (thien van)) thai son va thanh 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 van) OR (thien van)) thai son va thanh 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 van) OR (thien van)) thai son va thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te cac) or (te cao)) ky lang xa hoi. ((hieu van) OR (thien van)) thai son va thanh vi cua tre*.