I recently learned the importance of doing a comprehensive search as opposed to a hit-and-run approach. What do I mean?
In Colonial Virginia for example, my ancestor Robert Patterson received a land grant, except in VA it was called a land patent. There were several steps to this however.
First you had to record a Land Entry. Next, a Survey was in order. Lastly, a Land Patent could be obtained. Once it was patented, it could be sold to another person, and that would fall under the heading of Deed.
You would be surprised at what I found once I started digging for these various items on my ancestor. Details were different about his land from one "event" to another.
Here's a good article about what was found and why it's important to look for all of these items, not just the survey, or any other single item.