Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"pham le cong snippets" » "phan le cong snippets", "pham lan cong snippets", "pham len cong snippets", "pham te cong snippets", "pham ve cong 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 le cong 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 le cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( pham le cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("pham le cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.