The problem I see most often with non-technical users attempting to search for non-trivial queries is not that they don't know those words, but they don't know

The problem I see most often with non-technical users attempting to search for non-trivial queries is not that they don't know those words, but they don't know which words are most important. e.g. One might formulate searches like: "How to stop an app from downloading my emails?" "Take back permission from fleep" Neither of which provide helpful results. Non-technical users could have a hard time differentiating between "gmail" and "email", or associating "Connect with gmail" with "permissions Google". (Or even "gmail" and "Google" - "Why would my email be related to search?")