Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
qua pham » quan pham, quy pham, qua cham
pham duy » pham duc
vinh cuu » dinh cuu, sinh cua, dinh cu
so sach » so sanh, bo sach, co sach
xang xa » lang xa, mang xa, ang xa
duy ban » uy ban, duy van, duy can
y xang » ty xang
vi cuu » vi luu

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 qua pham duy ban thanh ((vi cuu) or (vinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y xang xa hoi. hieu qua pham duy ban thanh ((vi cuu) OR (vinh cuu)) tre.
• Adding a wildcard symbol may retrieve word variants: so sach y xang xa hoi. hieu qua pham duy ban thanh ((vi cuu) or (vinh cuu)) tre*.