Google Search Terms - Keywords within Keywords?

[Berticus]

I am almost completely new to IM, but I have been lurking for some time now. During my analysis of the Google Sniper videos that recently popped up in the WSO section I began to wonder...

Can you have keywords within keywords? Let me demonstrate (I'm using one of the Google Sniper example page's keywords, if this is not acceptable by Jani G or George Brown I will change them):

groom wedding toast << This was the main keyword used.

bride and groom wedding speech
father of groom wedding speech
Groom wedding speech examples
Groom wedding speech jokes

These four are obviously derivatives of the first. My question is this: does google take a given keyword, in this case "groom wedding speech" and count it for every instance?

If this is the case then finding and using LSI keywords simply becomes a matter of finding direct derivatives of the original which then allows you and me to stack a primary (targeted) keyword as much as we like so long as we have derivative/LSI keywords as a major part of that stack.

Observations?

-Albert