Perhaps you should try some spelling variations:
vay khac » vay khach, va khac, tay khao
va trien » va truyen, va thiet, va tuyen
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
hanh ve » hanh vi, hanh kem
hanh va » hang va, hanh vi
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: vay khac y nang x hoi. hieu ve cac luc va ((hanh ve) or (hanh va)) va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vay khac y nang x hoi. hieu ve cac luc va ((hanh ve) OR (hanh va)) va trien.
• Adding a wildcard symbol may retrieve word variants: vay khac y nang x hoi. hieu ve cac luc va ((hanh ve) or (hanh va)) va trien*.