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