Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"wei pan toan snippets" » "wei van toan snippets", "wei dan toan snippets", "wei manh toan snippets", "wei tan toan snippets", "wei tang toan snippets", "wei fang 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: (((("wei pan toan 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 pan toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( wei pan toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("wei pan toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.