Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den noi cong snippets" » "den nguoi cong snippets", "den tai cong snippets", "den thi cong snippets", "dien noi cong snippets", "den coi cong snippets", "den voi 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: (((("den noi 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: (((("den noi cong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den noi cong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den noi cong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.