Perhaps you should try some spelling variations:
"programming languages classification methods." » "programming language versification methods.", "programming algae classification methods.", "programming guinea classification methods.", "programaming languages classification methods.", "programsming languages classification methods.", "programasming languages classification methods."
"program language classical methods." » "program language classical period.", "program language classical myth.", "programa language classical methods.", "programs language classical methods.", "programas language classical methods."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("program language classical methods.") or ("programming languages classification methods."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("program language classical methods.") OR ("programming languages classification methods."))*.
• Removing quotes may allow a broader search: (( program language classical methods. ) or ( programming languages classification methods. ))*.