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