Perhaps you should try some spelling variations:
"multi option research : july 2019" » "multi opinion research : july 2019", "multi action research : july 2019", "multi optics research : july 2019", "multi location research : july 2019", "multi population research : july 2019", "multi ratios research : july 2019", "multi option research : july 2012", "multi option research : july 2015", "multi option research : july 2020"
"multi option research : july 2013" » "multi opinion research : july 2013", "multi action research : july 2013", "multi optics research : july 2013", "multi location research : july 2013", "multi population research : july 2013", "multi ratios research : july 2013"

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: (("multi option research : july 2019") OR ("multi option research : july 2013"))~.
• Removing quotes may allow a broader search: (( multi option research : july 2019 ) or ( multi option research : july 2013 ))~.
• Adding a wildcard symbol may retrieve word variants: (("multi option research : july 2019") or ("multi option research : july 2013"))*.