Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dong chen du snippets" » "dong chan du snippets", "dong che du snippets", "dong chuyen du snippets", "dong chen yu snippets", "dong chen bui snippets", "dong chen den 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: (((("dong chen du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong chen du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong chen du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong chen du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.