You can modify the cart search settings by going to Store Module > Store Settings > Cart Search Settings. You can control the products that are resulted in the cart search by defining them as "Sell Online" or "Finished Goods". If you don't define these settings, then the cart search will result any search matches from your entire product database.
If you turn on these filters for the Cart Search function, you will need to adjust the individual products in the Product Manager of the Store Module.
The video below outlines how this feature of the OrderMaxx Store Module works: