Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nghe tan do snippets" » "nghe dan do snippets", "nghe san do snippets", "nghe han do snippets", "nghe tang do snippets", "nghe toan do snippets", "nghe tuan do snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("nghe tan do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nghe tan do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nghe tan do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nghe tan do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.