Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
va thanh » gia thanh, ban thanh, va tinh
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 » lang xa, mang xa, ang xa
ve cac » va cac
luc va » duc va, tuc va, loc 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 hoi. hieu ((ve cac) OR (vien cac)) luc va thanh du cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty xang xa hoi. hieu ((ve cac) OR (vien cac)) luc va thanh du cua te".
• Adding a wildcard symbol may retrieve word variants: so sach ty xang xa hoi. hieu ((ve cac) OR (vien cac)) luc va thanh du cua te*.