Perhaps you should try some spelling variations:
"research progress" » "research projects"
"research problems" » "research projects"
"research process" » "research projects", "research papers", "research proceedings"

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: (((((("research process") OR ("research problems"))) OR ((("research progress") OR ("research program"))))) OR ("research project")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"research process\") OR (\"research problems\"))) or (((\"research progress\") or (\"research program\"))))) or (\"research project\"))".
• Removing quotes may allow a broader search: (((((( research process ) OR ( research problems ))) or ((( research progress ) or ( research program ))))) or ( research project )).
• Adding a wildcard symbol may retrieve word variants: (((((("research process") OR ("research problems"))) or ((("research progress") or ("research program"))))) or ("research project"))*.