Perhaps you should try some spelling variations:
"research procedures" » "search procedures", "search procedure", "research processes"
"research proposals" » "research proposal", "research protocols", "research programs"
"research prozess" » "research progress", "research processes", "research proteases"
"research propels" » "research prospects", "research projects", "research progress"
"research process" » "research progress", "research projects", "research problems"

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