Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
banh vi » ban vi, benh vi, banh chi
xuc ban » duc ban, cuc ban, quoc ban
lam xuc » cam xuc, lam duoc
sach ty » sach y, sach thu, xach tay
van lam » van nam
nang xa » nang x, lang xa, nang ma
sach tu » sach thu, cach tu, sach uu
cua tre » cua te, cuu tre, cua triet

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 tu)) nang xa hoi. hieu van lam xuc ban ((banh vi) OR (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tu)) nang xa hoi. hieu van lam xuc ban ((banh vi) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach tu)) nang xa hoi. hieu van lam xuc ban ((banh vi) OR (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach tu)) nang xa hoi. hieu van lam xuc ban ((banh vi) OR (hanh vi)) cua tre*.