Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"wei wang cao snippets" » "wei tang cao snippets", "lei wang cao snippets", "wei fang cao snippets", "wei nang cao snippets", "wei lang cao snippets", "wei wang hao 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 wang cao 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 wang cao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( wei wang cao snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("wei wang cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.