Perhaps you should try some spelling variations:
khanh bui » thanh bui, thanh bai, khanh duy
su triet » su viet, su tien, ve triet
truc van » truc va, thuc van, truc ban
vien cac » vien bach, vien dai, gian cac
khanh di » khanh duy, thanh doi, hanh de
su sach » so sach, vu sach
vien da » vien dai, hien dai
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
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: su sach v nang x hoi. hieu ((vien cac) OR (vien da)) truc van ((khanh di) OR (khanh bui)) su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang x hoi. hieu ((vien cac) or (vien da)) truc van ((khanh di) OR (khanh bui)) su triet~".
• Adding a wildcard symbol may retrieve word variants: su sach v nang x hoi. hieu ((vien cac) or (vien da)) truc van ((khanh di) OR (khanh bui)) su triet*.