Perhaps you should try some spelling variations:
"and implementation in loading problem" » "and implementation and loading problem" (Expand search), "and implementation of loading problem" (Expand search), "and implementation in routing problem" (Expand search), "and implementation in planning problem" (Expand search), "and implementation in leading problem" (Expand search), "and implementation ii loading problem" (Expand search), "and implementation i loading 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (("and implementation in loading problem") OR ("using python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"and implementation in loading problem\") OR (\"using python python python programming\"))".
• Removing quotes may allow a broader search: (( and implementation in loading problem ) OR ( using python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("and implementation in loading problem") OR ("using python python python programming"))*.