Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
sach ty » sach tu, sach thu, xach tay
xang xa » lang xa, mang xa, ang xa
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
soc van » hoc van, oc van, sac van
cua tre » cua te, cuu tre, dua tren

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) OR (sach y)) xang xa hoi. hieu vu cham soc van hanh vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) xang xa hoi. hieu vu cham soc van hanh vi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach y)) xang xa hoi. hieu vu cham soc van hanh vi ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach y)) xang xa hoi. hieu vu cham soc van hanh vi ((cua tre) or (cua triet))*.