Different keywords for different forum sections

[lovecraft22]

Hi all;
I have a forum about Apple products: some sections are mac related while some others are iPhone related and so on…

Now, if one looks for

"email che non si cancella" (meaning: "cannot delete an email") on google the first link to appear will be

http://intotheapple.com/problemi-software/605-risolto-email-non-cancella-mail.html

which is actually on my forum.

The problem comes if one looks for:

"email che non ci cancella mac" (meaning: "cannot delete an email mac") my forum doesn't appear.


Now, I could add a "mac" tag to that discussion, but, since that forum section is all about macs, I would need to do that for every discussion.

Is there an easier way to achieve this?

Also: lots of my threads do not appear on google even though I have vbSeo… could that be the same problem?

Thank you!