Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"pham xuan o2 snippets" » "pham luan o2 snippets", "pham quang o2 snippets", "pham van o2 snippets", "pham xuan loi snippets", "pham xuan hoa snippets", "pham xuan son 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 xuan o2 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 xuan o2 snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( pham xuan o2 snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("pham xuan o2 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.