Perhaps you should try some spelling variations:
"nice river / fast" » "nene river / fast", "doce river / fast", "hime river / fast", "ndee river / fast"
"ice river / fast" » "dee river / fast"
"nile river / fast" » "nine river / fast", "nie river / fast", "nils river / fast"

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: (((("nice river / fast") OR ("ice river / fast"))) OR ("nile river / fast")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"nice river / fast\") OR (\"ice river / fast\"))) or (\"nile river / fast\"))".
• Removing quotes may allow a broader search: (((( nice river / fast ) OR ( ice river / fast ))) or ( nile river / fast )).
• Adding a wildcard symbol may retrieve word variants: (((("nice river / fast") OR ("ice river / fast"))) or ("nile river / fast"))*.