Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet hat do snippets" » "viet nhat do snippets", "viet ha do snippets", "viet dat do snippets", "viet hat doi snippets", "viet hat dao snippets", "viet hat de 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 hat 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 hat do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet hat do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet hat do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.