Search plugin (I18N)

[asemion]

Hi, for all.
Very nice and useful plugin. Many thanks to mvlcek from me too.
The overall operation of this plugin logic I almost understood.
It works very well with single Tags and Words. Contents is filtered correctly and quickly.
But all additionally entered filters works with the logical AND condition.
Is the proposed in the plugin filter connection with condition OR?

So I want to ask the question - how to make in order to filter the content by using a few one kind of Tags or Words with logical OR condition?
For example:
I have a catalog of products, and it is indexed (as tags) by manufacturers. When I choose for example manufacturer Bosh - content correctly filtered and only show results that are produced by Bosh. But when entered an additional manufacturer like AEG, the filter does not show content completely. What should be done to show the content from of the two filters at once?
Is it possible to do so we can work with a several of these tags or words in the filters? This is how to make such filtering system, which uses e-commerce CMS for their catalogs filtering?
Thank you in advance for your answers.
Andrejus.