Please create documentation describing how to tune eZ Publish for situations when there are multiple search terms involved. This can be done largely by configuring the "mm" parameter (Minimum Match) in solrconfig.xml. By default, it is configured like that:

<!-- mm explanation: for the values below:
	1, 2 keywords: at least one must match
	from 3-5 keywords, at least 2-4 must match
	from 6-7 keywords, at least 4-5 must match
	above 7 keywords, 60% of them must match
-->
<str name="mm">
	1&lt;1 2&lt;-1 5&lt;-2 7&lt;60%
</str>

...which is OK under most circumstances i.e. if your search involves up to two terms. Beyond that, some tuning may be required so that results remain consistent and within expectations.