Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"duc van cac snippets" » "duc va cac snippets", "duc tan cac snippets", "duc manh cac snippets", "duc van hac snippets", "duc van cau snippets", "duc van bac 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 van cac 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 van cac snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duc van cac snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duc van cac snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.