Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"don quan den snippets" » "doan quan den snippets", "don quang den snippets", "dan quan den snippets", "don quan doan snippets", "don quan he snippets", "don quan doi 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: (((("don quan 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: (((("don quan den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( don quan den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("don quan den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.