search: 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/search - from package: cjdns-tools
/usr/bin/search - from package: sphinx

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

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