Not all tweets gathered

[AnsFli]

I tried searching for Tweets by one user by using the 'searchTerm <- "@TwittterName"'; apart from receiving a lot of tweets, that simply replied to @TwitterName which I sorted out afterwards, I noticed that not all tweets of @TwitterName were returned. I checked for the return limits but was still way below the 1000. Any ideas? Or any other way, to search for tweets of one user precisely (not having to sort them out after the search)?

[sarikayamehmet]

For user search use that

searchTerm <- "(from%3ArealDonaldTrump)" # for user search