Perhaps you should try some spelling variations:
hieu luc » hieu luat, hieu qua
van tuan » van quan, van ban, anh tuan
ban hanh » ban hang
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
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) OR (su sach)) ty xang xa hoi. hieu luc cam xuc ((van tuan) OR (ban hanh)) vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ty xang xa hoi. hieu luc cam xuc ((van tuan) or (ban hanh)) vi cua te~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ty xang xa hoi. hieu luc cam xuc ((van tuan) or (ban hanh)) vi cua te*.