Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"huy phong o2 snippets" » "duy phong o2 snippets", "hai phong o2 snippets", "huy dong o2 snippets", "huy phong mot snippets", "huy phong voi snippets", "huy phong 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: (((("huy phong 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: (((("huy phong o2 snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( huy phong o2 snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("huy phong o2 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.