Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"lap dan chen snippets" » "lap dan chan snippets", "lap yan chen snippets", "lap can chien snippets", "lap dat chen snippets", "lap ban chen snippets", "hap dan 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: (((("lap dan 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: (((("lap dan chen snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( lap dan chen snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("lap dan chen snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.