Perhaps you should try some spelling variations:
kien chao » vien cao, dien cho, kien chi
khien cho » khien hoc, hiem cho, dien cho
hanh vai » hanh vi, hanh va, hanh tai
cac khoi » cac thoi, cac khoan, cach thoi
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
me va » te va, ke va, le va
xu va » xu van, tu va, su va
ky va » ly va, ke va, my 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 sac ((ky va) or (me va)) cac khoi. dieu ((kien chao) OR (khien cho)) xu va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ((ky va) OR (me va)) cac khoi. dieu ((kien chao) OR (khien cho)) xu va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ((ky va) or (me va)) cac khoi. dieu ((kien chao) OR (khien cho)) xu va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ((ky va) or (me va)) cac khoi. dieu ((kien chao) OR (khien cho)) xu va hanh vai cua tre*.