Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc can chan snippets" » "duc dan chan snippets", "duc cam chan snippets", "duc ban chan snippets", "duc tan chan snippets", "duy can chan snippets", "duc van chan 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: (((("duc can chan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duc can chan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc can chan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc can chan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.