Perhaps you should try some spelling variations:
"multiple optics research : july 2009" » "multiple options research : july 2009", "multiple domains research : july 2009", "multiple choices research : july 2009", "multiple haptics research : july 2009", "multiple omics research : july 2009", "multiple robotics research : july 2009", "multiple optics research : july 2008", "multiple optics research : july 2007", "multiple optics research : july 2019"
"multi action research : july 2009" » "multi national research : july 2009", "multi actor research : july 2009", "multi option research : july 2009", "multi location research : july 2009", "multi action research : july 2008", "multi action research : july 2007", "multi action research : july 2019"

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: (("multiple optics research : july 2009") OR ("multi action research : july 2009"))~.
• Removing quotes may allow a broader search: (( multiple optics research : july 2009 ) or ( multi action research : july 2009 ))~.
• Adding a wildcard symbol may retrieve word variants: (("multiple optics research : july 2009") or ("multi action research : july 2009"))*.