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