Perhaps you should try some spelling variations:
"springer science using lexicon" » "stronger science using lexicon", "spring resilience using lexicon", "springer springe using lexicon", "springer science using lexical"
"river science using mexico" » "driven science using mexico", "laser science using mexico", "cyber science using mexico", "river science using lexico", "river science using mexican", "river science aging mexico"

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: (("river science using mexico") OR ("springer science using lexicon")).
• Removing quotes may allow a broader search: (( river science using mexico ) or ( springer science using lexicon )).
• Adding a wildcard symbol may retrieve word variants: (("river science using mexico") or ("springer science using lexicon"))*.