Google School: Synonyms. Use synonyms when you want to search for a concept rather than a specific word sequence. By searching for ~nutrition ~information muffins,
you tell Google to find related terms for each item tagged with a tilde
(~). You'll find not only exact matches (e.g. Muffin Nutrition
Information), but matches on Muffins Food Facts and Muffins Vitamin
Information. Searching for ~car turns up information on trucks and vehicles. Searching for ~pen yields pencils, graphite and sketch. [Lifehacker]