Do you remember those items' names you missed ?
Try to add items by pressing "shift" and "~" in-game and type item xxxxxx .(There is a "space" between "item" and "xxxxx")
http://princess.kingsbountygame.com/codes.php
If you forgot those names or got nothing , maybe you can refer to the thread :
http://forum.1cpublishing.eu/showthread.php?t=35841