I've assumed quotes meant one or more words were wanted in that order, not as keywords ("to be or not to be" = I don't mean a lot of documents including all those words, but rather that exact phrase) whereas + meant that particular word or phrase had to be in the page (melting abs +plastic = I'm not concerned with placement, but the term "plastic" has to be explicitly mentioned on the page, not related from another page, as I'm wanting to melt ABS plastic as opposed to reshape my abdominals). I considered + as the opposite of -, which is usually the easier way to narrow something down (melting abs -muscle -workout). Oh well..