Is a bill of sale legal for piece of land and how do I get the deed?

Q: The owner sold me part of his land and now he said he can’t split.

A: No one can answer that question on the limited information you have given. I would need to know much, much more. A real estate attorney should review the sales agreement, the deed, the map and so forth. It may be that the seller had good intentions but now he realized he needs to subdivide his lot to sell you a portion. The subdivision of property requires much work and usually involves getting zoning approval from the municipality. It concerns me that you think you were sold a piece of land but do not mention that your name is on the deed. It sounds like neither of you has an attorney and you need the advice.