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