Search for text within tagged content

Is the search box just about words or is there any special clauses you can query?

It seems that we have several pieces of search on the web site. You can search by tag (constrained or not to a section of the web site) and by code words. It would be really great if we could combine all them Soon enough (hopefully) we will have just too many results

For example I would like to type on the search box something like:

in:forum tag:qml "create object"

Is currently any way to do something like this?

Original title: gmail like search on "search box"