Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
qua cac » cua cac
hang di » hang doi, hang dien, hang dich
hang vi » hang va, hanh vi, khang voi
luc va » duc va, tuc va, loc va
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi, x ho

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 ky nang x hoi. hieu qua cac ((luc va) OR (tuc xa)) ((hang di) OR (hang vi)) cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu qua cac ((luc va) or (tuc xa)) ((hang di) OR (hang vi)) cua tu~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu qua cac ((luc va) or (tuc xa)) ((hang di) OR (hang vi)) cua tu*.