Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"han viet dk snippets" » "san viet dk snippets", "van viet dk snippets", "dan viet dk snippets", "han viet da snippets", "han viet du snippets", "han viet duc 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 dk 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 dk snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( han viet dk snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("han viet dk snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.