Perhaps you should try some spelling variations:
"using java code slippers" » "using data code slippers"
"cong so danh snippets" » "cong san danh snippets", "cong hoa danh snippets", "cong do danh snippets", "cong so sanh snippets", "cong so 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.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java code slippers") OR ("cong so danh snippets"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( using java code slippers ) or ( cong so danh snippets ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java code slippers") or ("cong so danh snippets"))) or ("locating bug code snippets"))*.