Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"dung san cao snippets" » "dong san cao snippets", "dung sai cao snippets", "dung luan cao snippets", "dung san co snippets", "dung san cho snippets", "dung san bao 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"using java core snippets\") OR (\"dung san cao snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( using java core snippets ) OR ( dung san cao snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java core snippets") OR ("dung san cao snippets"))) OR ("locating bug code snippets"))*.