Perhaps you should try some spelling variations:
thanh du » thanh de, thanh do, thanh tu
so sach » so sanh, bo sach, hoc sach
hieu ve » hieu va, hieu van
xang xa » lang xa, mang xa, ang xa
co sach » bo sach, cuon sach, hoc sach
ve cac » va cac, vien cac
loc va » hoc va
luc va » duc va, tuc va
du cua » duy cua, dau cua, dum cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) OR (co sach)) ty xang xa hoi. hieu ve cac ((loc va) or (luc va)) thanh du cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) ty xang xa hoi. hieu ve cac ((loc va) OR (luc va)) thanh du cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (co sach)) ty xang xa hoi. hieu ve cac ((loc va) or (luc va)) thanh du cua te".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (co sach)) ty xang xa hoi. hieu ve cac ((loc va) or (luc va)) thanh du cua te*.