Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
va thanh » gia thanh, ban thanh, va tinh
so sach » so sanh, bo sach, co sach
va hanh » van hanh, va danh, ban hanh
xang xa » lang xa, mang xa, ang xa
y xang » ty xang
ve cac » va cac
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 y xang xa hoi. hieu ((ve cac) or (vien cac)) xuc ((va hanh) OR (va thanh)) du cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y xang xa hoi. hieu ((ve cac) OR (vien cac)) xuc ((va hanh) OR (va thanh)) du cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y xang xa hoi. hieu ((ve cac) or (vien cac)) xuc ((va hanh) OR (va thanh)) du cua te*".