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