Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"co doc than snippets" » "co doc thanh snippets", "co doc phan snippets", "co doc thau snippets", "co duoc than snippets", "co hoc than snippets", "co dot than 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 ("co doc than snippets"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( using java core snippets ) or ( co doc than snippets ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java core snippets") or ("co doc than snippets"))) or ("locating bug code snippets"))*.