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