In the Community Edition of DNN, it's up to the module developer to support the search, not the other way around. They need to support DNN's iSearchable interface, if it doesn't then there's no way for content from the module to show up in the results. Only the DNN Pro version and above have a spider that can index the pages without the module having to support the interface.

Hi Thomas,

The Store module implement the ISearchable interface! Because you can place more than one Store Catalog module on your portal pages, you have to define which Store Catalog module provide catalog informations to the DNN search provider. Never activate more than one Store Catalog module with this feature or your products will be displayed several times in the search results!
Go to the settings of the main Store Catalog module, verify than 'Enable Content Indexing' is checked. Go to Host > Search Admin and click on 'Re-Index Content'.

Gilles

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We (team members) are Humans offering their knowledge, their work and their spare time FOR FREE to benefit the community. It would be so particularly appreciated that your messages begin with "Hello" and end with "Thank you" or any other form of politeness. Ask yourself what your reaction would be, if you were approached by me (a total stranger) on the street to ask you something without saying "Hello" nor "Thank you"? After several years of services dedicated to the community, I begin to be tired to read requests without any form of politeness.