Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cheng lu du snippets" » "cheng lin du snippets", "zheng liu du snippets", "chen yu du snippets", "cheng luc du snippets", "cheng ly du snippets", "cheng li du 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: (((("cheng lu 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: (((("cheng lu du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cheng lu du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cheng lu du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.