type this google dork in google search maybe you lucky to find some secrete passwords.

filetype:htpasswd htpasswd
intitle:"index of” “.htpasswd” -intitle:"dist” -apache -htpasswd.c
index.of.private (algo privado)
intitle:index.of master.passwd
inurlasslist.txt
intitle:"index of..etc” passwd
intitle:admin intitle:login
“incorrect syntax near” (sql script error)
intitle:"the page cannot be found” inetmgr
intitle:index.of ws_ftp.ini
“supplied arguments is not a valid postgresql result” (possible debilidad sql)
_vti_pvt password intitle:index.of (frontpage)
inurl:backup intitle:index.of inurl:admin
“index of /backup”
index.of.password
index.of.winnt
inurl:"auth_user_file.txt”
“index of /admin”
“index of /password”
“index of /mail”
“index of /” +passwd
index of /” +.htaccess
index of ftp +.mdb allinurl:/cgi-bin/ +mailto
allintitle: “index of/admin”
allintitle: “index of/root”
allintitle: sensitive filetype:doc
allintitle: restricted filetype :mail
allintitle: restricted filetype:doc site:gov
administrator.pwd.index
authors.pwd.index
service.pwd.index
filetype:config web
gobal.asax index
inurlasswd filetype:txt
inurl:admin filetype:db
inurl:iisadmin
inurl:"auth_user_file.txt”
inurl:"wwwroot/*.”
allinurl: winnt/system32/ (get cmd.exe)
allinurl:/bash_history
intitle:"index of” .sh_history
intitle:"index of” .bash_history
intitle:"index of” passwd
intitle:"index of” people.1st
intitle:"index of” pwd.db
intitle:"index of” etc/shadow
intitle:"index of” spwd
intitle:"index of” master.passwd
intitle:"index of” htpasswd
intitle:"index of” members or accounts
intitle:"index of” user_carts or user _cart