Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"dung cua si snippets" » "dung luan si snippets", "dung cho si snippets", "dung cua su snippets", "dung cua vi snippets", "dung cua so snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code 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: (((("using java core snippets") OR ("dung cua si snippets"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( using java core snippets ) or ( dung cua si snippets ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java core snippets") or ("dung cua si snippets"))) or ("locating bug code snippets"))*.