Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"viet du le snippets" » "viet duc le snippets", "viet duy le snippets", "viet tu le snippets", "viet vu le snippets", "viet do le 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 du le 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 du le snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( viet du le snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("viet du le snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.