throw "var" directory size problem

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I have problem in var directory, while installed i gave 10GB to var folder. But system throw, var directory not have enough space, But var directory content have only 766.5 MB and Free space have only 937.6 MB. I don't know where all other space. go to var directory proprieties, this show only766.5 MB content . what is the problem and how to recover free space.

var directory spce given: df -h

/dev/mapper/fedora_raj-var   9.8G  8.4G  895M  91% /var

var propertices details :

    Name : var
    Type:    Folder (inode/directory)
   Contents: 36,312 items, totalling 766.5 MB (some contents unreadable)
   Location:  /
  Free space: 937.6 MB