Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
vu khanh » vu thanh, van khanh, duy khanh
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
goc va » hoc va, loc va, uoc va
doc va » duoc va, hoc va, duc va
vi cua » vai cua, di cua
ve hoc » te hoc, va hoc, vi hoc

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 ve hoc ((goc va) or (doc va)) hanh vi 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 ve hoc ((goc va) OR (doc va)) hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu khanh)) ky nang xa hoi. hieu ve hoc ((goc va) or (doc va)) hanh vi cua viet*.