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