Perhaps you should try some spelling variations:
vu khanh » vu thanh, van khanh, duy khanh
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
cac luc » cau luc, coc luc, cac nuoc
luc gia » luoc gia, duc gia, quoc gia
dam cua » dai cua, day cua, dan cua

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

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