Question

Is it possible to search unanswered question for a certain tag?

Comments

You can surely do this if you modify the core. Specifically in qa-include/db/selects.php you can see various select specs. On search, you can take in a tag also as argument and do this.

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Can it be done by a plugin, without touch the core? Is there some plugin to go and start?

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Yes, being search you can do it without modifying the core. This is a tagsearch plugin which I made like that. Most of the code here is simply copy pasted from Q2A core.

http://www.question2answer.org/qa/52496/tag-search-plugin-free

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I've seen your plugin, thank you very much for everything !

Answer 1

No, not directly I'm afraid. You would have to browse questions with that tag for those labelled with 0 answers.

Comments

It should be a plugin to do some types of advanced search: http://www.question2answer.org/qa/13114/feature-request-expert-search