Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"wei tang rok snippets" » "wei tan rok snippets", "wei zhang rok snippets", "le tang rok snippets", "wei hang rok snippets", "wei trang roi snippets", "wei tang o 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 tang rok 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 tang rok snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( wei tang rok snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("wei tang rok snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.