Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
ve triet » va trien, su triet
hieu ve » hieu va, hieu van
cau luc » cau truc, cau phuc
hanh vu » hanh vi, hanh tu, hanh xu
hanh ve » hanh vi, hanh kem
hanh va » hang va, hanh vi
nang o » nang co, nang ho, nang ro
ve cau » ke cau, va cau, ve cac
luc va » duc va, tuc va, loc va
y nang » ky nang, ly nang, v nang
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 y nang o hoi. hieu ve cau luc va ((((hanh vu) OR (hanh ve))) or (hanh va)) ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach y nang o hoi. hieu ve cau luc va ((((hanh vu) OR (hanh ve))) OR (hanh va)) ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu khach y nang o hoi. hieu ve cau luc va ((((hanh vu) OR (hanh ve))) or (hanh va)) ve triet".
• Adding a wildcard symbol may retrieve word variants: vu khach y nang o hoi. hieu ve cau luc va ((((hanh vu) OR (hanh ve))) or (hanh va)) ve triet*.