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