Perhaps you should try some spelling variations:
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
thanh du » thanh de, thanh tu, thanh dung
thanh do » thanh de, thanh pho, thanh hoa
so sach » bo sach, co sach, hoc sach
so sanh » do sanh
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
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 (so sanh)) ty xang xa hoi. hieu ve cac nuoc va ((thanh du) OR (thanh do)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) ty xang xa hoi. hieu ve cac nuoc va ((thanh du) OR (thanh do)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (so sanh)) ty xang xa hoi. hieu ve cac nuoc va ((thanh du) OR (thanh do)) cua te".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) ty xang xa hoi. hieu ve cac nuoc va ((thanh du) OR (thanh do)) cua te*.