Perhaps you should try some spelling variations:
"python python python python programming" » "pythons python pythons python programming" (Expand search), "piton python piton python programming" (Expand search), "pitons python pitons python programming" (Expand search)
"code coding and parallel programming" » "code coding in parallel programming" (Expand search), "code coding _ parallel programming" (Expand search), "code cloning and parallel programming" (Expand search), "code codigo and parallel programming" (Expand search), "code according and parallel programming" (Expand search), "code coding rna parallel 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: (("code coding and parallel programming") OR ("python python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"code coding and parallel programming\") OR (\"python python python python programming\"))*".
• Removing quotes may allow a broader search: (( code coding and parallel programming ) OR ( python python python python programming ))*.