Perhaps you should try some spelling variations:
khanh bui » thanh bui, thanh bai, khanh duy
hieu vien » hieu hien, hieu viec, thieu nien
su triet » su viet, su tien, ve triet
cac truc » cau truc, cac trung, sach truc
khanh di » khanh duy, thanh doi, hanh de
su sach » so sach, vu sach
cac tru » ca tru, cac tro, cac thu
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.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach v nang x hoi. hieu vien ((cac truc) or (cac tru)) van ((khanh di) OR (khanh bui)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang x hoi. hieu vien ((cac truc) OR (cac tru)) 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 truc) or (cac tru)) 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 truc) or (cac tru)) van ((khanh di) OR (khanh bui)) su triet*.