Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"han viet ke snippets" » "san viet ke snippets", "van viet ke snippets", "dan viet ke snippets", "han viet ve snippets", "han thiet ke snippets", "han viet yen 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: (((("han viet ke snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("han viet ke snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( han viet ke snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("han viet ke snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.