Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van du chen snippets" » "van yu chen snippets", "van cu chien snippets", "van hui chen snippets", "van duy chen snippets", "van dau chen snippets", "van de 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: (((("van du 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: (((("van du chen snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van du chen snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van du chen snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.