Hi. Not a very clear question indeed :)
Some places are hard to find a rent for many reasons. Sometime it may be because it is a nice area where the owner like to live. If they have two home and one is on the top of a hill and the other at bottom, they will usually preffer to live on the hill with a nice view, making a lot less of renting home on the top of that hill than on the bottom. Some have enough money to not need to rent, so you will see a lot less house to rent in rich area. If you live in an area with a lot of worker and few constructions, all house may already be rented
One other thing. If you see house for sale, you could always contact the sellers to see if they are interested to rent it. Some are often on the market since long and having to pay the tax each year without any benefit from them can make some accept the idea.