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