Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"pham lan du snippets" » "pham luan du snippets", "pham van du snippets", "phan lan du snippets", "pham lan dau snippets", "pham lang du 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 lan du 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 lan du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( pham lan du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("pham lan du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.