Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"liu yang do snippets" » "liu ying do snippets", "lijun yang do snippets", "liu yaning do snippets", "liu dang do snippets", "liu tang do snippets", "liu nang doc 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: (((("liu yang do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("liu yang do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( liu yang do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("liu yang do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.