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