Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
ban hanh » ban hang
khach ty » sach ty
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu van
duc ban » duc tan, duc van, dua ban
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai
vi su » va su, ki su, oi su
ve su » va su

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 ty nang o hoi. ((hieu ve) or (hieu va)) cam duc ban hanh ((vi su) or (ve su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach ty nang o hoi. ((hieu ve) OR (hieu va)) cam duc ban hanh ((vi su) OR (ve su)) triet.
• Adding a wildcard symbol may retrieve word variants: vu khach ty nang o hoi. ((hieu ve) or (hieu va)) cam duc ban hanh ((vi su) or (ve su)) triet*.