Perhaps you should try some spelling variations:
van khanh » van thanh, van hanh, van anh
hieu hien » bieu hien, dieu hien, chieu chien
su triet » su viet, su tien, ve triet
khanh di » khanh bui, khanh duy, thanh doi
truc van » truc va, thuc van, truc ban
cac truc » cau truc, cac tru, cac trung
hien cac » thien cac, vien cac, hieu cac
vu sach » vu bach, su sach, vu khach
va nang » van nang, da nang, cam nang
v nang » vu nang, van nang, voi nang
x hoi » xa hoi, x ho, 5 hoi
di su » doi su, ki su, da su
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((v nang) or (va nang)) ((x hoi) OR (o hoi)). hieu hien cac truc van khanh di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((v nang) OR (va nang)) ((x hoi) OR (o hoi)). hieu hien cac truc van khanh di su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((v nang) or (va nang)) ((x hoi) OR (o hoi)). hieu hien cac truc van khanh di su triet".
• Adding a wildcard symbol may retrieve word variants: vu sach ((v nang) or (va nang)) ((x hoi) OR (o hoi)). hieu hien cac truc van khanh di su triet*.