Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
va trien » va truyen, va thiet, va tuyen
hieu ve » hieu va, hieu van
hanh ve » hanh vi, hanh kem
hanh va » hang va, hanh vi
cau luc » cau truc, cau phuc
ve cau » ke cau, va cau, ve cac
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
x hoi » o hoi, x ho, 5 hoi

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 ((x hoi) OR (xa hoi)). hieu ve cau luc va ((hanh ve) or (hanh va)) va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach y nang ((x hoi) OR (xa hoi)). hieu ve cau luc va ((hanh ve) OR (hanh va)) va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu khach y nang ((x hoi) OR (xa hoi)). hieu ve cau luc va ((hanh ve) or (hanh va)) va trien".
• Adding a wildcard symbol may retrieve word variants: vu khach y nang ((x hoi) OR (xa hoi)). hieu ve cau luc va ((hanh ve) or (hanh va)) va trien*.