Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"pha huong cua snippets" » "phan thuong cua snippets", "pham thuong cua snippets", "pham chuong cua snippets", "pha dung cua 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 ("pha huong cua snippets"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( using java core snippets ) or ( pha huong cua snippets ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java core snippets") or ("pha huong cua snippets"))) or ("locating bug code snippets"))*.