Royalty Free Image – Bad return

Hello, in ECHO RSS, I am trying to use the system to replace highlighted images with images from the Royalty Free Image system. However, I cannot get it to search for images related to the word I defined. The images included in the post are random images. For example, I have an RSS that comes from Google News, whose filter is Dollar (the American currency) and I also use the word dollar as a filter for the images. I have tried using the options in the Main Settings of Pexels, Pixabay, Google Images Search Usage, Unsplash, and randomly, some images are related to the title and others are not. Is there a field where I can define a word to associate the image? At the moment, all of these image systems are enabled, but I also tried with 1 at a time. I have attached the image of how the configuration is within the RSS capture system "Rss To Post Rules" menu. My website link is: veerinsider.com you can check on the Menu, Brasil or World. I also can provide you access to the website, please help me with it. Thanks.