Better searching
Google it - top tips
You can restrict results to PDFs only to get reports, which are likely to have more substantive information than webpages. You can also restrict a search to PPT, which will show presentations.
More details and tips:
Google search help: https://support.google.com/websearch/answer/134479?hl=en
Google Scholar: https://scholar.google.com/ ??
Google Books: https://books.google.com/ ?
Google Advanced Search: https://www.google.co.uk/advanced_search ??