Perhaps you should try some spelling variations:
"online caring research effects" » "online caring research efforts", "online caring research aspects", "online caring research projects", "online curing research effects", "online sharing research effects", "online hearing research effects", "online charging research effects", "online caching research effects"
"online vain search document" » "online pain search document", "online brain search document", "online chain search document", "online domain search document", "online axion search document"

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: (("online vain search document") OR ("online caring research effects")).
• Removing quotes may allow a broader search: (( online vain search document ) or ( online caring research effects )).
• Adding a wildcard symbol may retrieve word variants: (("online vain search document") or ("online caring research effects"))*.