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