Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van duc son snippets" » "van duy son snippets", "van du son snippets", "tran duc son snippets", "van duc ton snippets", "van duc con 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 ("van duc son snippets"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( python using java snippets ) or ( van duc son snippets ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("python using java snippets") or ("van duc son snippets"))) or ("locating bug code snippets"))*.