Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
hieu luc » hieu luat, hieu qua
ban hanh » ban hang
sach ty » sach y, sach tu, xach tay
xang xa » lang xa, mang xa, ang xa
luc cam » luc lam, luc tam, xuc cam
vi cua » vai cua, di cua
cua te » cua tu

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) OR (sach thu)) xang xa hoi. hieu luc cam xuc ((van ban) OR (ban hanh)) vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach thu)) xang xa hoi. hieu luc cam xuc ((van ban) or (ban hanh)) vi cua te~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach thu)) xang xa hoi. hieu luc cam xuc ((van ban) or (ban hanh)) vi cua te*.