Perhaps you should try some spelling variations:
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
sac van » san van, sat van, tac van
cac van » cac dan
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

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