Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khac don den snippets" » "khac do den snippets", "khac son den snippets", "khac duan den snippets", "khac don dien snippets", "khac dan den snippets", "khac don dep 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: (((("khac don 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: (((("khac don den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khac don den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khac don den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.