Welcome to the Q&A Forum

I use "nested" for lack of a better term; what I mean is keyword phrases that contain other keyword phrases. For example, if I have a page that is extremely well optimized (on-page) for the phrase "old silver coins", is that page by default also extremely well optimized (on-page) for the phrase "silver coins"? Or does google understand that I am optimizing for the longer phrase "old silver coins" and somehow exclude me from contention for the sub-phrase "silver coins"? I understand that this gets more complicated when talking about backlinks (off-page), but the same general question remains. If I am getting good backlinks for "old silver coins", am I also getting good backlinks for "silver coins" at the same time? I do understand that "silver coins" may be more competitive than "old silver coins" and so my page may not rank the same for the two phrases. But I am really curious if there is some kind of multiplier effect with nested keyword phrases like the example I have provided, or whether google somehow only credits for the full phrase and not for any sub-phrases contained therein. Any insight would be greatly appreciated!  (And sorry if this has been addressed already. I have looked around the site and have googled this question, but haven't found anything useful yet.) Thanks. BONUS QUESTION: Are the answers to my questions above exactly the same when discussing singular versus plural keywords ("coins" versus "coin")? After all, that is a "nested case just like my examples above. On the other hand, I can see there being some special treatment of singular and plural.