use the following search parameters to narrow your results:
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subreddit:subreddit
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find submissions in "subreddit"
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author:username
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find submissions by "username"
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site:example.com
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find submissions from "example.com"
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url:text
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search for "text" in url
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selftext:text
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search for "text" in self post contents
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self:yes (or self:no)
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include (or exclude) self posts
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nsfw:yes (or nsfw:no)
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include (or exclude) results marked as NSFW
e.g. subreddit:aww site:imgur.com dog
see the search faq for details.