Perhaps you should try some spelling variations:
edf statistics » adf statistic, pdf statistisch, motif statistics
2f statistics » motif statistics, proof statistics
f statistics » f statistic, f statistical, f statisch
2c vital » 23 vital, _ vital, a vital

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: %22iceland %((2f statistics) OR (((edf statistics) OR (f statistics))))%2c vital%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22iceland %((2f statistics) or (((edf statistics) OR (f statistics))))%2c vital%22".
• Adding a wildcard symbol may retrieve word variants: %22iceland %((2f statistics) or (((edf statistics) OR (f statistics))))%2c vital%22*.