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

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