Perhaps you should try some spelling variations:
"and computation using string problem" » "and computations using string problem" (Expand search), "and computation in string problem" (Expand search), "and composition using string problem" (Expand search), "and computational using string problem" (Expand search), "of computation using string problem" (Expand search), "and computation using sizing problem" (Expand search), "and computation using rostering problem" (Expand search), "and computation using sharing problems" (Expand search), "and computation using strong problem" (Expand search), "and computation using spring problem" (Expand search), "and computation using strains problem" (Expand search)
"usando python python python programming" » "usando pythons python python programming" (Expand search), "usando piton python python programming" (Expand search), "usando pitons 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 computation using string problem") OR ("usando python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"and computation using string problem\") OR (\"usando python python python programming\"))".
• Removing quotes may allow a broader search: (( and computation using string problem ) OR ( usando python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("and computation using string problem") OR ("usando python python python programming"))*.