Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh ca » thanh cha, thanh cac, thanh ha
soc van » hoc van, oc van, sac van
tu cham » toc cham, thi cham
sach ty » sach tu, sach thu, xach tay
vu cham » va cham, vu kham, qua cham
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
ca cua » co 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 y)) nang ma hoi. hieu ((vu cham) OR (tu cham)) soc van thanh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang ma hoi. hieu ((vu cham) OR (tu cham)) soc van thanh ca cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach y)) nang ma hoi. hieu ((vu cham) OR (tu cham)) soc van thanh ca cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) nang ma hoi. hieu ((vu cham) OR (tu cham)) soc van thanh ca cua tre*.