Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ngu va can snippets" » "ngu van can snippets", "ngu ca can snippets", "nguoi va can snippets", "ngu va chan snippets", "ngu va cac snippets", "ngu va cao 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: (((("ngu va can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ngu va can snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ngu va can snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ngu va can snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.