Add-on Change search of XF Resources, if that is possible XF1

[Robert9]

I like the idea to search for a resource that has

prefix3, prefix9,prefix12 and is located in cat_id 11 or 13 or 17.

But i dont like that the search of XF needs a phrase to search for.

So my question:

Is it possible to change the search for resources, that i can search for

{nothing/anything}
plus some prefixes
in some categories?

Somehwere in xf we have a query like

where fieldx = "%phrase%" AND prefix_id IN [x,y,z] AND cat_id IN [a,b,c]
and i need
where fieldx = "%" AND prefix_id IN [x,y,z] AND cat_id IN [a,b,c]
OR
where prefix_id IN [x,y,z] AND cat_id IN [a,b,c]