Perhaps you should try some spelling variations:
"using java core snippets" » "using data core snippets"
"dang tong liu snippets" » "dang trong liu snippets", "dang cong liu snippets", "dang tung liu snippets", "dang qiong liu snippets", "dang cong li snippets", "dang hong li 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 ("dang tong liu snippets"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( using java core snippets ) or ( dang tong liu snippets ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java core snippets") or ("dang tong liu snippets"))) or ("locating bug code snippets"))*.