Perhaps you should try some spelling variations:
"research procedures" » "search procedures", "search procedure", "research processes"
"research proteases" » "research processes", "research progresses", "research projektes"
"research prozess" » "research progress", "research processes", "research projects"
"research propels" » "research prospects", "research proposals", "research projects"
"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 proteases"))) OR ("research propels"))))) OR ("research process")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"research procedures\") or (((((\"research prozess\") OR (\"research proteases\"))) or (\"research propels\"))))) or (\"research process\"))".
• Removing quotes may allow a broader search: (((( research procedures ) or ((((( research prozess ) OR ( research proteases ))) or ( research propels ))))) or ( research process )).
• Adding a wildcard symbol may retrieve word variants: (((("research procedures") or ((((("research prozess") OR ("research proteases"))) or ("research propels"))))) or ("research process"))*.