Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dau luan den snippets" » "dan luan den snippets", "dat luan den snippets", "khau luan den snippets", "dau quan den snippets", "dau luan de snippets", "dau luan len 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: (((("dau luan den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dau luan den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dau luan den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dau luan den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.