Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu cua » hieu qua, dieu cua, bieu cua
van hanh » ban hanh, van anh, van ban
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
cua tuc » cua duc, cua thuoc, luat tuc
cac tu » cac thu, cach tu, cac du
cua tu » cua su, cua cu, cua te

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 hanh) OR (van thanh)) vi ((cua tu) OR (cua tuc))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty mang xa hoi. hieu cua cac tu ((van hanh) or (van thanh)) vi ((cua tu) OR (cua tuc))~".
• Adding a wildcard symbol may retrieve word variants: te sach ty mang xa hoi. hieu cua cac tu ((van hanh) or (van thanh)) vi ((cua tu) OR (cua tuc))*.