Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
va thanh » gia thanh, ban thanh, le thanh
khach ky » hanh ky, thanh ky
va triet » va thiet, va trien, ve triet
hieu ve » hieu va, hieu van
va tinh » may tinh
cac luc » cau luc, coc luc, cac nuoc
co hoi » co hoc, co loi
ve cac » va cac, vien cac
lam va » nam va, dam va, lam ha
o hoi » o hoc, o hai, o hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu khach ky nang ((o hoi) or (co hoi)). hieu ve cac luc ((va thanh) OR (va tinh)) lam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ky nang ((o hoi) OR (co hoi)). hieu ve cac luc ((va thanh) OR (va tinh)) lam va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu khach ky nang ((o hoi) or (co hoi)). hieu ve cac luc ((va thanh) OR (va tinh)) lam va triet".
• Adding a wildcard symbol may retrieve word variants: vu khach ky nang ((o hoi) or (co hoi)). hieu ve cac luc ((va thanh) OR (va tinh)) lam va triet*.