Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc cong da snippets" » "duc cuong da snippets", "dung cong da snippets", "nuoc cong da snippets", "duc cong dan snippets", "duc cong dac snippets", "duc cong dau 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 cong da 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 cong da snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc cong da snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc cong da snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.