Perhaps you should try some spelling variations:
thanh du » thanh de, thanh do, thanh tu
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
xang xa » mang xa, ang xa, dang xay
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
loc va » hoc va, luc 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 ty ((xang xa) or (lang xa)) hoi. hieu ve cac ((loc va) or (duc va)) thanh du cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty ((xang xa) OR (lang xa)) hoi. hieu ve cac ((loc va) OR (duc va)) thanh du cua te.
• Adding a wildcard symbol may retrieve word variants: so sach ty ((xang xa) or (lang xa)) hoi. hieu ve cac ((loc va) or (duc va)) thanh du cua te*.