Perhaps you should try some spelling variations:
2017 english » 2 english, 1 english, 7 english
2015 english » 2 english, 1 english, 5 english
21 english » 210 english, 2 english, 1 english
10 english » 1 english, 11 english, 14 english
2f texts » 2 texts, _ texts, 1 texts
20 texts » 2 texts, 20 tests, _ texts

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: %22hymns%((21 english) OR (((((2017 english) OR (2015 english))) OR (10 english)))) %((2f texts) OR (20 texts))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22hymns%((21 english) or (((((2017 english) OR (2015 english))) or (10 english)))) %((2f texts) or (20 texts))%22".
• Adding a wildcard symbol may retrieve word variants: %22hymns%((21 english) or (((((2017 english) OR (2015 english))) or (10 english)))) %((2f texts) or (20 texts))%22*.