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Multiple words [e.g., gas vans] finds only those documents that contains all words.
Wild cards: gas* matches gas, gassed, gassing, etc.
Exact phrase: "gas vans" will find only documents that contain this exact phrase (limit one exact phrase per search).
Character case is ignored.
If your browser supports it, typing a search term such as gas and pausing will automatically suggest possible word completions based on the texts.