Perhaps you should try some spelling variations:
"online brain research elements" » "online brain research experiments", "online brain research effects", "online brain research students", "online train research elements", "online bin research elements", "online brand research elements"
"online hand search document" » "online band search document", "online handel search document", "online brand search document", "online hana search document", "online hard search document", "online add search document"
"online paid search document" » "online part search document", "online path search document", "online page search document", "online grid search document", "online based 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 brain research elements") OR ((("online hand search document") OR ("online paid search document")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"online brain research elements\") or (((\"online hand search document\") OR (\"online paid search document\"))))".
• Removing quotes may allow a broader search: (( online brain research elements ) or ((( online hand search document ) OR ( online paid search document )))).
• Adding a wildcard symbol may retrieve word variants: (("online brain research elements") or ((("online hand search document") OR ("online paid search document"))))*.