should search scope be restricted without modifiers?

I thought that when I give no modifier to restrict the search scope, all message elements are searched, but apparently it is not so.

I regularly get forwarded emails to handle and a number of times I claimed that I had never got them. I just had another such a situation and I found that I could not find a specific email, because I was using unqualified search. Technically speaking, I discovered that if I use the "q" modifier to search explicitly the quoted body text, I find the "missing" emails.

Is there a way to search both quoted and unquoted texts together? Having to search each term twice, once unquoted and then quoted, is rather awkward and prone for mistakes.