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Is your content (products) stored in a database? If so, it should be fairly simple to write a script that takes user input (the search terms), cleans them up, and runs a SQL query against the database to find similar records.
If your content isn't in a database, this will be quite a bit harder. An easier option might be incorporating one of Google's free site search tools you can add.
If you're looking for a very quick solution, you can always provide a google search feature on your website. If you're looking for a custom solution, you'll need to have a database back-end holding the data you wish to search. You'll need to write a script that will take the user's input and apply it to a sql query to help them find the results they wish to see.
Oh ok thanks, erm no I don't have a database with the products on, could anyone give me an idea on how to do this and then code the search function to look through it like you mentioned.