Are you wanting to search in your own journal, or site-wide?
If you just want to look in your journal, there's a FAQ entry here that explains how to search for multiple tags. Ex, if you want to look through your entries tagged both 'fanfic' and 'writing', use a URL like this: http://princess-gecko.dreamwidth.org/tag/fanfic,writing?mode=and You should be able to chain as many keywords as you want, just make sure you provide the right mode at the end. (You can also switch that to 'or' if you want entries tagged with any of the tags you provide, not all.)
If you're searching other people's journals (site-wide) I don't think there's a way to narrow down to just the tags, I believe the search engine always checks against the body text and title.
Hope that helps! (Also, Lava Reef Zone's bgm is one of my favourites ever.)
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If you just want to look in your journal, there's a FAQ entry here that explains how to search for multiple tags. Ex, if you want to look through your entries tagged both 'fanfic' and 'writing', use a URL like this: http://princess-gecko.dreamwidth.org/tag/fanfic,writing?mode=and You should be able to chain as many keywords as you want, just make sure you provide the right mode at the end. (You can also switch that to 'or' if you want entries tagged with any of the tags you provide, not all.)
If you're searching other people's journals (site-wide) I don't think there's a way to narrow down to just the tags, I believe the search engine always checks against the body text and title.
Hope that helps! (Also, Lava Reef Zone's bgm is one of my favourites ever.)