If you search for
delete this, the second keyword doesn't appear in the search results. I suspect this is due to typical search optimizations, but depending on the context, it might be of interest.
I couldn't find any way to force the keyword to be taken into account (usually with quotes or a plus).
Does such a syntax exist? I think the search engine should emphasize that the keyword has been removed. I know this is a really specific search, but I'm sure we can find other examples (especially in the programming area).