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You will need to construct separate select statements for each search criteria which may sound like a lot of work, however that gives you an advantage in that with a bit of care you can add weights to each search allowing you to promote certain matches over others. For example a match on a title may be worth more than a match on a category. This is something that you can slowly work with and refine but if you have a lot of small sql queries then you will be able to progress down that path.
The first thing that you will need to do is combine the different searches together for example two queries may return the same row on a table. To keep a count of the number of times a row is duplicated you may want to use the php function array_intersect() and then you can combine two arrays using array_merge() and then remove duplicates with array_unique(). You can then sort it using asort() or probably arsort().
Have fun and learn a little more about SQL and PHP.
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