Perhaps you should try some spelling variations:
"based computation pid controller problem" » "based computation pid control problem" (Expand search), "based computation pid controller role" (Expand search), "based computation pid controlled probe" (Expand search), "based computational pid controller problem" (Expand search), "based competition pid controller problem" (Expand search), "based compilation pid controller problem" (Expand search), "based computation and controller problem" (Expand search), "based computation in controller problem" (Expand search), "based computation is controller problem" (Expand search), "based computation pid controllers problem" (Expand search)
"using python python python programming" » "using pythons python python programming" (Expand search), "using piton python python programming" (Expand search), "using pitons python python programming" (Expand search), "usando python python python programming" (Expand search), "in python python python programming" (Expand search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"based computation pid controller problem\") OR (\"using python python python programming\"))~".
• Removing quotes may allow a broader search: (( based computation pid controller problem ) OR ( using python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("based computation pid controller problem") OR ("using python python python programming"))*.