Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"pham hoan o2 snippets" » "pham hoang o2 snippets", "phap hoan o2 snippets", "nham hoan o2 snippets", "pham hoan doi 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 hoan 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 hoan o2 snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( pham hoan o2 snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("pham hoan o2 snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.