Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu cua » hieu qua, dieu cua, bieu cua
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty mang » ty xang, ty hang, tin mang
mang xa » lang xa, mang may, dang xay
van anh » tuan anh, van minh
cac tu » cac thu, cach tu, cac du
cua tu » cua tuc, cua cu, cua te
cua su » qua su

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty mang xa hoi. hieu cua cac tu ((van anh) OR (van thanh)) vi ((cua tu) OR (cua su))~.
• Adding a wildcard symbol may retrieve word variants: te sach ty mang xa hoi. hieu cua cac tu ((van anh) or (van thanh)) vi ((cua tu) or (cua su))*.