Perhaps you should try some spelling variations:
song cuu » song cua, song ngu, cong cu
te sach » toc sach
hieu ve » hieu va, hieu van
san cuu » san cua, san huu, sang cua
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, ma hoa, me hoi
ve cac » va cac, vien cac
du gia » duc gia, dau gia, vu gia

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 y nang ((ma hoi) OR (xa hoi)). hieu ve cac du gia thanh ((san cuu) OR (song cuu)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((ma hoi) OR (xa hoi)). hieu ve cac du gia thanh ((san cuu) or (song cuu)) tre~".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((ma hoi) OR (xa hoi)). hieu ve cac du gia thanh ((san cuu) or (song cuu)) tre*.