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