How to create a dynamic if condition

Hello im trying to write a searchtool for filenames which allow to search with multiple words. At the moment i can just search for one word but i want to filter my results with more words combined.

here is my code so far:

        public List<String> startYareSearch(string query, string source)
    {

        List<String> SearchResultList = new List<String>();
        List<String> FileNameList = getFileNames(source);

        foreach (string fileName in FileNameList)
        {
            if (fileName.IndexOf(query, StringComparison.OrdinalIgnoreCase) >= 0)
            {
                SearchResultList.Add(fileName);
                continue;
            }
        }

        return SearchResultList;

    }

i think that i need an function which recieves the queries from an array and generate a dynamic if condition.

for an example:

String[] queries=  new string[] { "Tobias", ".txt"};

String fileName= "blablaTobiasbla.txt";

if (fileName.IndexOf("Tobias", StringComparison.OrdinalIgnoreCase) >= 0 || fileName.IndexOf(".txt", StringComparison.OrdinalIgnoreCase) >= 0)
                {
                    SearchResultList.Add(fileName);
                    continue;
                }

is it possible to create an if condition dynamically? Do you know a better solution?