vm-support: 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/vm-support - from package: open-vm-tools

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

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