Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khac son da snippets" » "khach san da snippets", "khanh son da snippets", "thai son da snippets", "khac song da snippets", "khac son la snippets", "khac son ha 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 son da 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 son da snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khac son da snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khac son da snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.