Combinatorial optimization

Hello! Please help me develop an algorithm for the solution of the problem in databases (preferably in php). Brief description of the task. There are several trucks with goods, and have several buyers who are ready to buy this product. Each truck has a certain number of goods. Each buyer has a minimum and a maximum limit on the number of purchased goods. You want to generate all possible combinations of distribution trucks on the buyers. Detailed description the link https://docs.google.com/spreadsheets...it?usp=sharing