Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"wei liang du snippets" » "wei zhang du snippets", "wei tang du snippets", "lee liang du snippets", "wei lang du snippets", "wei liang yu snippets", "wei liang guo 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 liang du 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 liang du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( wei liang du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("wei liang du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.