Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dong duy dot snippets" » "dong huy dot snippets", "cong duy dot snippets", "dong duoc dot snippets", "dong duy doc snippets", "dong duy dong 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: (((("dong duy dot snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong duy dot snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong duy dot snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong duy dot snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.