Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dan viet bot snippets" » "danh viet bot snippets", "san viet bot snippets", "dao viet bot snippets", "dan viec bot snippets", "dan viet o snippets", "dan viet co 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 bot 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 bot snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dan viet bot snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dan viet bot snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.