RewriteRule ^admin/load/loadSearch/([a-fA-F0-9])/([a-fA-F0-9])$ admin/load/loadsearch.php?type=$1&id=$2 [L]
RewriteRule ^admin/load/loaddSearch/([a-fA-F0-9])/([a-fA-F0-9])/(.*)$ admin/load/loadsearch.php?type=$1&id=$2&lname=$3 [L]

it's not working help me ..the 3rd get value is optional

Most likely this is exactly what you would like:

RewriteRule ^admin/load/loadSearch/([a-fA-F0-9])/([a-fA-F0-9])/?$ admin/load/loadsearch.php?type=$1&id=$2 [L]
RewriteRule ^admin/load/loaddSearch/([a-fA-F0-9])/([a-fA-F0-9])/(.*)$ admin/load/loadsearch.php?type=$1&id=$2&lname=$3 [L]