Perhaps you should try some spelling variations:
"using java java snippets" » "using data java snippets", "using java java slippers"
"cao cong danh snippets" » "cao cuong danh snippets", "cao cong dan snippets", "cao cong thanh snippets", "cac cong danh snippets", "cao dang danh snippets", "cua cong danh snippets", "cao cong danh slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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