Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"do qing chen snippets" » "do bing chen snippets", "do ping chen snippets", "do liang chen snippets", "do quang chen snippets", "do tieng chen 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: (((("do qing chen snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("do qing chen snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( do qing chen snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("do qing chen snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.