Perhaps you should try some spelling variations:
"multi option research : july 2012" » "multi opinion research : july 2012", "multi action research : july 2012", "multi optics research : july 2012", "multi location research : july 2012", "multi population research : july 2012", "multiple options research : july 2012", "multi option research : july 2013"
"multi ratios research : july 2007" » "multi rating research : july 2007", "multi relations research : july 2007", "multi actions research : july 2007", "multi radio research : july 2007", "multi rate research : july 2007", "multi pairs research : july 2007", "multi ratios research : july 2008", "multi ratios research : july 2013", "multi ratios research : july 2020"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("multi option research : july 2012") or ("multi ratios research : july 2007"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("multi option research : july 2012") OR ("multi ratios research : july 2007")).
• Removing quotes may allow a broader search: (( multi option research : july 2012 ) or ( multi ratios research : july 2007 )).
• Adding a wildcard symbol may retrieve word variants: (("multi option research : july 2012") or ("multi ratios research : july 2007"))*.