Sometimes, it can be difficult to search websites using their built-in search functions - and sometimes those functions don't even exist. Google has a site search feature that can help you find what you're looking for on a third-party website.
Simply go to www.google.com and type "site:[search term]" into the search bar.
This will bring up all pages on the domain you entered that use your terms.
Twitter does have an Advanced Search, but at this time, I don't see a way to access it if you don't know the specific URL. Here it is: https://twitter.com/search-advanced?lang=en
Twitter is difficult to search - the platform only displays the most recent 3,200 Tweets from a given user, and doesn't have an obvious way to change search settings.
To look at a time period for a specific user, type the following string into the search bar: from:username since:yyyy-mm-dd until:yyyy-mm-dd
Example:
This also works for hashtags, e.g., you could search "from:#repealthe8th since:2018-01-01 until:2018-06-01."