Perhaps you should try some spelling variations:
vu khanh » vu thanh, van khanh, duy khanh
hieu voi » hieu moi, lieu voi, hieu loi
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
voi hoc » hoi hoc, vi hoc, voi ho
hoc goc » hoc hoc, hoc nuoc, hoc duoc
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
goc va » hoc va, loc va, doc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (vu khanh)) ky nang xa hoi. hieu voi hoc goc va danh vi ((va thiet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu khanh)) ky nang xa hoi. hieu voi hoc goc va danh vi ((va thiet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu khanh)) ky nang xa hoi. hieu voi hoc goc va danh vi ((va thiet) or (cua viet))*.