Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"pham luan da snippets" » "phap luan da snippets", "pham quang da snippets", "pham van da snippets", "pham luan dac snippets", "pham luan day snippets", "pham luan va 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: (((("pham luan 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: (((("pham luan da snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( pham luan da snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("pham luan da snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.