Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
thai son » thai den, thai do, thai hoc
tham soc » cham soc, tham nuoc, ham so
cua tre » cua te, cuu tre, cua triet
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
ha hoi » hoa hoi, ha noi, xa hoi
ve cac » va cac, vien cac
te cac » tu cac, te cao, 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 (ve cac)) ky lang ha hoi. hieu va ((tham soc) or (thai son)) va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te cac) OR (ve cac)) ky lang ha hoi. hieu va ((tham soc) OR (thai son)) va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te cac) OR (ve cac)) ky lang ha hoi. hieu va ((tham soc) or (thai son)) va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te cac) OR (ve cac)) ky lang ha hoi. hieu va ((tham soc) or (thai son)) va hanh vai cua tre*.