Perhaps you should try some spelling variations:
tinh vai » tinh va, tinh hai, tinh bai
cham loc » cham soc, chon loc, cham o
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
loc may » hoc may, loc mau, loai may
hieu va » hieu qua
sach ty » sach y, sach tu, sach thu
hieu ve » hieu van
mang xa » lang xa, mang may, dang xay
ty mang » ty xang, ty hang, tin mang
cua tre » cua te, cuu tre, cua triet

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: su sach ty mang xa hoi. ((hieu ve) OR (((hieu va) OR (lieu va)))) cham loc may tinh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty mang xa hoi. ((hieu ve) or (((hieu va) OR (lieu va)))) cham loc may tinh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ty mang xa hoi. ((hieu ve) or (((hieu va) OR (lieu va)))) cham loc may tinh vai cua tre*.