Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh vi » hanh vi, thanh va, thanh ve
hieu va » lieu va, hieu qua
soc van » hoc van, oc van, sac van
cua tre » cua te, cuu tre, cua triet
sach ty » sach tu, sach thu, xach tay
hieu vu » hieu ve, hieu su, dieu vu
xang xa » lang xa, mang xa, ang xa
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) or (hieu va)) cham soc van thanh 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) OR (hieu va)) cham soc van thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach y)) xang xa hoi. ((hieu vu) or (hieu va)) cham soc van thanh vi cua tre*.