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I would like to search:

  1. only by the content and title of Questions
  2. which contain the phrase "exactly two"
  3. and which are marked with the [logic] tag.

Thus, I typed into the Search function everything in this box: $\boxed{\text{ "Exactly two" [logic] is: question }}$.

The Search function returned only 1 result: How do I convince someone that $1+1=2$ may not necessarily be true? (Try https://math.stackexchange.com/search?q=%22Exactly+two%22+[logic]+is%3A+question).

However, I was actually questing after something like:
How to convert an English sentence that contains "Exactly two" or "Atleast two" into predicate calculus sentence?
● and Sentence such that the universe of a structure has exactly two members.

Why didn't the Search function divulge these two links? Should I have input something different into the Search bar?

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That is because you put a space between is: and question.

If you used "Exactly two" [logic] is:question with no space between the is: operator and the keyword question, you get this result which is precisely what you expected.

This is the same for all the advanced search operators: do not put a space on either side of the colon : mark.

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    $\begingroup$ This question - which was on of the OP's example - is not among the results when I try your link. Neither is this one. Maybe the quotation marks used in the title of question might be the culprit? $\endgroup$ – Martin Sleziak Aug 30 '13 at 9:48
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    $\begingroup$ When I try searching for title:"exactly two" [logic], I only get one question. I expected this search to return the questions with the phrase "exactly two" in the title; several examples given in this posts are missing. $\endgroup$ – Martin Sleziak Aug 30 '13 at 10:01
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    $\begingroup$ @MartinSleziak: that... might be a bug. It seems that it is not picking up on the quoted phrase "exactly two". I'll ask around to see what's up. $\endgroup$ – Willie Wong Aug 30 '13 at 17:34
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    $\begingroup$ MSO link, hopefully this will be fixed. Thanks for your sharp eyes @MartinSleziak $\endgroup$ – Willie Wong Aug 30 '13 at 17:42
  • $\begingroup$ @WillieWong: Thank you. Could you please write again after the issue is fixed? $\endgroup$ – Greek - Area 51 Proposal Sep 1 '13 at 15:21
  • $\begingroup$ @MartinSleziak: Thank you for mooting your question. $\endgroup$ – Greek - Area 51 Proposal Sep 1 '13 at 15:22

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