bluetooth: 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/bluetooth - from package: tlp

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

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