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

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