Perhaps you should try some spelling variations:
"heart proteins references" » "heart process references", "heart properties references", "heart prospects references", "heat proteins references", "yeast proteins references", "wheat proteins references"
"ear originsal reference" » "ear original references", "ear regional reference", "ear origin references", "ear origins reference", "her original reference", "year origins reference"
"year horizons references" » "year hormones references", "year motions references", "year ions references", "your horizons references", "near horizon references", "far horizons references"
"heart origins references" » "heart origin references", "heart resins references", "heart chains references", "health origins references", "year origins references"

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: (("ear originsal reference") OR ((((("heart origins references") OR ("heart proteins references"))) OR ("year horizons references")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"ear originsal reference\") or (((((\"heart origins references\") OR (\"heart proteins references\"))) or (\"year horizons references\"))))".
• Removing quotes may allow a broader search: (( ear originsal reference ) or ((((( heart origins references ) OR ( heart proteins references ))) or ( year horizons references )))).
• Adding a wildcard symbol may retrieve word variants: (("ear originsal reference") or ((((("heart origins references") OR ("heart proteins references"))) or ("year horizons references"))))*.