In other cases, you might need to expand your topic if you're not finding any resources. Rather than looking asking "What has Driscoll Children's Hospital done to combat nursing burnout rates?" try asking "What are the effects of hospital-wide wellness programs on nurses?"
Sometimes we have trouble narrowing down out topic into something that's manageable.
Try asking a specific question about your topic to help you focus.
So rather than researching "vaccines," ask a question that you can answer through your research, like "How has social media contributed to the anti-vaccination movement?"