How can I reset the search value for DataTables

I tried to reset the search value but it didn't work, the reason I did so was because the column value I saved in the database was tcvn3, so I wanted to convert the search value to tcvn3 so that when searching DataTables system returns exact results

$query = DB::table('_Notice')->select(['ID', 'ContentID', 'Subject', 'Article', 'EditDate']);
request()->input('search')['value'] = ConvertString::convertEncoding(request()->input('search')['value']);
$strJson = DataTables::of($query)->toJson();

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