Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc hoan den snippets" » "duc hoang den snippets", "duc hoa den snippets", "duc toan den snippets", "duc hoat den snippets", "duc doan dien snippets", "duc hoang yen 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: (((("duc hoan den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duc hoan den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc hoan den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc hoan den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.