Currently if you type multiple words into a Quick Search Box, the JQL generated is text ~ "foo bar".  I would like a mechanism whereby if I type multiple words into a Quick Search Box, the JQL generated is text ~ "foo" and text ~ "bar".

This would allow the results to find the cases where one of the words is in summary, and the other word is in description or comment.  At the moment, a result is returned if both words are in summary, or both words are in description or both words are in comment.

You can think of this as equivalent to a google search that will return all the text on the individual case page.  At the moment "foo bar" won't find case where foo is in summary and bar is in comment.

Whilst I can type the expanded JQL in Basic Search, that gets painful when you start having 4 or more terms. 

For more detail, see this question https://community.atlassian.com/t5/Jira-questions/Multiple-Words-in-Quick-Search-box/qaq-p/997365