Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den hoc cau snippets" » "dien hoc cau snippets", "dan hoc cau snippets", "de hoc cau snippets", "den hoc cao snippets", "den hoc cac snippets", "den hoc can snippets"
"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 ("den hoc cau snippets"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( den hoc cau snippets ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("den hoc cau snippets"))) or ("locating bug code snippets"))*.