Perhaps you should try some spelling variations:
"river science business model" » "river finance business model", "river service business model", "river science using model", "river science business models", "driven science business model", "laser science business model", "cyber science business model"
"springer single business model" » "springer springe business model", "springer eine business model", "springer silke business model", "springer simple business model", "springer wrangle business model", "springer using business model", "springer single business models"
"springer bridge business model" » "stringer bridge business model", "springer springe business model", "sprinkle bridge business model", "springer bring business model", "springer bridging business model", "springer edge business model", "springer bridge business models"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"river science business model\") OR (((\"springer single business model\") OR (\"springer bridge business model\"))))".
• Removing quotes may allow a broader search: (( river science business model ) OR ((( springer single business model ) OR ( springer bridge business model )))).
• Adding a wildcard symbol may retrieve word variants: (("river science business model") OR ((("springer single business model") OR ("springer bridge business model"))))*.