Perhaps you should try some spelling variations:
"online sharing research effects" » "online sharing research efforts", "online sharing research aspects", "online sharing research projects", "online learning research effects", "online changing research effects", "online aging research effects", "online searching research effects", "online shopping research effects"
"online brain search document" » "online train search document", "online bin search document", "online brand search document", "online brain research document", "online begin search document", "online chain search document"
"online vain search document" » "online pain search document", "online chain search document", "online train search document", "online von 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 brain search document"))) OR ("online sharing research effects")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"online vain search document\") OR (\"online brain search document\"))) or (\"online sharing research effects\"))".
• Removing quotes may allow a broader search: (((( online vain search document ) OR ( online brain search document ))) or ( online sharing research effects )).
• Adding a wildcard symbol may retrieve word variants: (((("online vain search document") OR ("online brain search document"))) or ("online sharing research effects"))*.