Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu luc » hieu luat, hieu qua
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
luc cam » luc lam, luc tam, xuc cam
vi cua » vai cua
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty xang xa hoi. hieu luc cam xuc ((van thanh) OR (ban hanh)) ((vi cua) OR (di cua)) te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty xang xa hoi. hieu luc cam xuc ((van thanh) or (ban hanh)) ((vi cua) OR (di cua)) te~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty xang xa hoi. hieu luc cam xuc ((van thanh) or (ban hanh)) ((vi cua) OR (di cua)) te*.