Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"long span dan snippets" » "cong san dan snippets", "dong san dan snippets", "nong san dan snippets", "long shan dan snippets", "long gian dan snippets", "long nhan dan 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("using java core snippets") or ("long span dan snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java core snippets") OR ("long span dan snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using java core snippets ) or ( long span dan snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java core snippets") or ("long span dan snippets"))) or ("locating bug code snippets"))*.