StokeySue - you should use the filters in the right column which are a direct match to the ingredient in the database. The word search looks for instances of the word in recipe title, ingredients, book title or author. If you want to be more accurate in those searches then put the words in speech marks e.g. "fish fillets" "bean sprouts". Adding the filters gives an exact match to the ingredient. So in your case you would select White fish under Ingredients / Fish & seafood. Then add the ingredients in speech marks. This is that search of the Library Online Recipes.
You can learn more about filters by following Tutorial 3 - the Tutorials are accessed from the green Need Help? button at bottom right (not available on phones). There is also this Help section.