let
    Source = Excel.CurrentWorkbook(){[Name="Таблица1"]}[Content],
    findNeeded = Table.TransformColumns(Source, {"Input", (item) =>
    let
        words = Text.Split(item, " "),
        onlyLong = List.Select(words, each Text.Length(_) > 2)
    in
        if List.Count(onlyLong) = 2 then Text.Combine(onlyLong, " ") else null
    , Text.Type})
in
    Table.SelectRows(findNeeded, each [Input] <> null)