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