Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc tri cong snippets" » "duc tai cong snippets", "duc thi cong snippets", "duc trien cong snippets", "duc tre cong snippets", "duy tri cong 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 tri cong 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 tri cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc tri cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc tri cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.