If you use a long query, Google might ignore some of your keywords. Maybe there aren't many results that match all your keywords or maybe some of them are redundant.
Google now shows a list of missing keywords below search results. Those words aren't included by the pages returned by Google, but the search results should still be relevant and useful.
To force Google to always match a keyword, use quotes. For example, when you search for [igzo mva "srgb"], "srgb" is always matched.