Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
hieu va » lieu va, hieu qua
hieu ve » hieu van
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
ty nang » ky nang, ty hang, ly nang
o hoi » co hoi, o hoc, o hai
vi su » va su, ve su, ki su

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

• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ((ty nang) OR (ty xang)) o hoi. ((hieu ve) OR (hieu va)) cam duc van hanh vi su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu khach ((ty nang) OR (ty xang)) o hoi. ((hieu ve) or (hieu va)) cam duc van hanh vi su triet~".
• Adding a wildcard symbol may retrieve word variants: vu khach ((ty nang) OR (ty xang)) o hoi. ((hieu ve) or (hieu va)) cam duc van hanh vi su triet*.