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Why are the instant question recommendations that appear when asking a question so much better/faster than the results from performing an actual query in the search field?
I understand that I can use quotes and tags to improve my search results. But if I simply type in "Detecting the end of a for loop in php" it returns "0 results". If, as recommended, I wrap the query in quotes I get "0 results". Let's simplify the query then and ask "for loop php", "0 Results". If I perform the same query in quotation marks with the tag [php] I start to get results, but not very good ones. This being a pretty vague query it returns vague results. In contrast if I click 'Ask Question' and start typing my query "Detecting the end of a for loop php.." I get instant, precise results.
Now I know that next to the query results you can click 'Advanced Search Tips' which gives you things like is:question and is:answer...but what does this mean? Do I prepend my question with "is:" or "is:question", both, either/or? SO offers things like tags and other various elements to assist in queries, but I will get a far more precise results if I simply click 'Ask Question' and start typing my question. Why isn't this query power available in the standard search field? Is it and am I simply not using it correctly?
How do YOU search on Stack Overflow? Please help me and the community become better Stack Overflow users. While I feel like this is a total noob question, I bet other people have experienced it as well so perhaps it's worthy of documentation.