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