Perhaps you should try some spelling variations:
thanh dum » thanh dam, thanh dung, thanh dat
so sach » so sanh, bo sach, co sach
dum cua » duy cua, dam cua, dung cua
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
xang xa » mang xa, ang xa, dang xay
ve cac » va cac, vien cac
loc va » hoc va
luc va » duc va, tuc va
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 (luc va)) thanh dum 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 (luc va)) thanh dum 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 (luc va)) thanh dum cua te*.