Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cong li don snippets" » "cong ti don snippets", "hong li don snippets", "cong hai don snippets", "cong la don snippets", "cong li ion snippets", "cong ly don 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: (((("cong li don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong li don snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong li don snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong li don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.