Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach ty » sach tu, sach thu, xach tay
soc van » hoc van, oc van, sac van
vu kham » vu khanh
vu cham » va cham, tu cham, qua cham
xang xa » lang xa, mang xa, ang xa
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: te ((sach ty) or (sach y)) xang xa hoi. hieu ((vu cham) OR (vu kham)) soc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach y)) xang xa hoi. hieu ((vu cham) OR (vu kham)) soc van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach y)) xang xa hoi. hieu ((vu cham) OR (vu kham)) soc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach y)) xang xa hoi. hieu ((vu cham) OR (vu kham)) soc van hanh vi cua tre*.