You can't search for something that you don't know about. There are many engineering solutions that designers and maintenance personnel need. That is wny we publishing companies send magazines to interested readers every month.
Just as an example, if an designer is not aware of a certaing type of valve that will help in her or him in their design, how can they search for it? On the other hand, if a designer reads Hydraulics & Pneumatics, he or she will learn about solutions they do not currently know.
You can't search for something online that you don't know about. Keep on reading and keep on advertising.