Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc phung du snippets" » "duc hung du snippets", "duc thang du snippets", "duc dung du snippets", "duc phung duc snippets", "duc phung vu snippets", "duc phung dung 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 phung du 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 phung du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc phung du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc phung du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.