Perhaps you should try some spelling variations:
thanh du » thanh do, thanh tu, thanh dung
thanh de » hanh de, thanh ve, thanh do
so sach » so sanh, bo sach, co sach
xang xa » mang xa, ang xa, dang xay
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
sach tu » sach thu, cach tu, sach ty
cac luc » cau luc, coc luc, cac nuoc
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va
cua tu » cua tuc, cua su, cua cu

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