I can search question with target using
[target] but the result questions also include question tagged with other tags.
How to get the question with only one specific tag?
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The internal Stack Exchange search mechanism does not support this kind of search, however we can use SEDE for that.
I have just written this query, where you put a tag name and get back the latest 5000 questions that have only this tag. (The limit is due to the amount of posts on SO, causing SEDE to crash with timeout if you try to select too many posts.)
For example, questions on Stack Overflow tagged only with php.
Just keep in mind, the data there is not live, but updated every Sunday, so you will not see questions posted between last Sunday and the current time.
I have extended this a bit for meta sites, where one of the four bug, support, feature-request, and discussion is mandatory. This query on SEDE will find all questions on a meta site, tagged with one those four mandatory tags plus the given desired tag, e.g. for the tags tag here on MSE.