Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dung viet _ slippers" » "nang viet _ slippers", "cong viet _ slippers", "mang viet _ slippers", "dung viet _ slippery", "dung viet _ grippers"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using java snippets") OR ("dung viet _ slippers"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( dung viet _ slippers ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("dung viet _ slippers"))) or ("locating bug code snippets"))*.