Perhaps you should try some spelling variations:
hieu cua » hieu qua, dieu cua, bieu cua
toc sach » hoc sach, doc sach, thuoc sach
anh hai » lanh hai, manh hai, anh thai
van anh » van thanh, tuan anh, van minh
mang xa » lang xa, mang may, dang xay
ty mang » ty xang, ty hang, tin mang
cac tu » cac thu, cach tu, cac du
tu van » tu va
cua tu » cua tuc, cua su, cua cu

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