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