vino-passwd: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/vino-passwd - from package: vino

You may install the required package with command yum install {package}

Error in other languages:
vino-passwd: bevel nie gevind nie
vino-passwd: comandă negăsită
vino-passwd: comando não encontrado
vino-passwd: commande introuvable
vino-passwd: command not found
vino-passwd: käsku ei ole
vino-passwd: không tìm thấy lệnh
vino-passwd: komanda nerasta
vino-passwd: Kommando nicht gefunden.
vino-passwd: kommandot finns inte
vino-passwd: komut yok
vino-passwd: nie znaleziono polecenia
vino-passwd: níor aimsíodh an t-ordú
vino-passwd: no se encontró la orden
vino-passwd: no s'ha trobat l'ordre
vino-passwd: opdracht niet gevonden
vino-passwd: parancs nem található
vino-passwd: perintah tidak ditemukan
vino-passwd: príkaz nenájdený
vino-passwd: příkaz nenalezen
vino-passwd: команда не найдена
vino-passwd: командата не е открита
vino-passwd: 命令找不到
vino-passwd: コマンドが見つかりません