Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet voi do snippets" » "viec voi do snippets", "viet doi do snippets", "viet duoi do snippets", "viet voi doi snippets", "viet voi ho snippets", "viet toi do 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: (((("viet voi do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("viet voi do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet voi do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet voi do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.