Perhaps you should try some spelling variations:
sach van » sach han, sach va, bach van
van nang » van quang, van ban, van dong
ban hang » ngan hang
ve triet » va trien
su triet » su viet, su tien
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam

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 van nang xa hoi. hieu ve cam xuc ((tuan anh) OR (ban hang)) vi ((ve triet) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach van nang xa hoi. hieu ve cam xuc ((tuan anh) or (ban hang)) vi ((ve triet) OR (su triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach van nang xa hoi. hieu ve cam xuc ((tuan anh) or (ban hang)) vi ((ve triet) OR (su triet))*.