Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
hanh vai » hanh vi, hanh va, hanh tai
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
ve cac » va cac
bo va » bao va, do va, so va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky lang xa hoi. hieu ((ve cac) OR (vien cac)) bo va hanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky lang xa hoi. hieu ((ve cac) OR (vien cac)) bo va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu cac ky lang xa hoi. hieu ((ve cac) OR (vien cac)) bo va hanh vai cua tre*.