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