Digger has the right idea.
I change out the vacuum cleaner bag - put in a new one - and vacuum away.
The new bag empties easily, and I usually find what I've lost.
But prevention is better than cure - I try not to drop stuff in the first place, or I keep looking till I find it - my wife and kids have been known to crawl around on their hands and knees helping to find that elusive little bit of plastic.......