Perhaps you should try some spelling variations:
"based implementation of loading problem" » "and implementation of loading problem" (Expand search), "based implementation of routing problem" (Expand search), "based implementation of planning 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 implementation of loading problem\") OR (\"using python python python programming\"))~".
• Removing quotes may allow a broader search: (( based implementation of loading problem ) OR ( using python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("based implementation of loading problem") OR ("using python python python programming"))*.