Perhaps you should try some spelling variations:
"and computational cost covering problem" » "and computational and covering problem" (Expand search), "and computational design covering problem" (Expand search), "and computational vision covering problem" (Expand search), "_ computational cost covering problem" (Expand search), "and computational cost routing problem" (Expand search), "and computational cost loading problem" (Expand search), "and computational forest covering problem" (Expand search), "and computational robust covering problem" (Expand search), "and computational short covering problem" (Expand search)
"using coding python python programming" » "using codigo python python programming" (Expand search), "using codigos python python programming" (Expand search), "using using python python programming" (Expand search), "using coding pythons python programming" (Expand search), "using coding piton python programming" (Expand search), "using coding pitons python programming" (Expand search), "using coping python python programming" (Expand search), "using coating python python programming" (Expand search), "using cooking 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 computational cost covering problem") OR ("using coding python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"and computational cost covering problem\") OR (\"using coding python python programming\"))".
• Removing quotes may allow a broader search: (( and computational cost covering problem ) OR ( using coding python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("and computational cost covering problem") OR ("using coding python python programming"))*.