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