Not every search tool is case sensitive. The default is typically lesson or plans in simple searching. However, again a word of caution, when using simple modes in some databases like Alta Vista , searching with quotation will often produce less effective results. If you have not found what you are looking for in the first 20 to 50 sites, give it up and go no further. Either reformulate your search or try another search tool.
Creativity is often the key to reformulating or rephrasing a search.
The discussion of how many pages are indexed in any particular search tools is generally discussed and in dispute. A sophisticated search requires many search tools. The number of relevant sites is more important than the number of sites searched. Often it is difficult to understand why a site is retrieved in a search. The Find or Ctrl-F feature will quickly allow you to search the text of a site and locate specific keywords.