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