Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"phan cac khoan snippets" » "nhan cach khoan snippets", "phan dau khoan snippets", "phan lap khoan snippets", "phan cac khoa snippets", "phan cac hoan 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 ("phan cac khoan snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java core snippets") OR ("phan cac khoan snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using java core snippets ) or ( phan cac khoan snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java core snippets") or ("phan cac khoan snippets"))) or ("locating bug code snippets"))*.