Put phrases in quotation marks: economy "south africa"
To search for your terms just in the titles of webpages, type intitle: in front of your terms: intitle:economy
To limit your results to a certain domain, type site:. in front of the domain you want (e.g., .gov, .edu, .org):
"air pollution" site:.org
To limit your results to a certain website, type site: in front of the website address you want:
women information and communication technologies site:www.un.org
women information and communication technologies site:www.unwomen.org
microplastics site:www.unenvironment.org
microplastics site:web.unep.org/environmentassembly
environment site:canada.ca