Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet duoi do snippets" » "viet doi do snippets", "viet duong do snippets", "viet dung do snippets", "viet duoc do snippets", "viet nguoi do snippets", "viet duoi goc 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 duoi 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 duoi do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet duoi do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet duoi do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.