Perhaps you should try some spelling variations:
"using java java snippets" » "using data java snippets", "using java java slippers"
"phan cong danh snippets" » "thanh cong danh snippets", "phan cuong danh snippets", "phan cong dan snippets", "phan cong thanh snippets", "phan 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: (((("phan cong danh snippets") or ("using java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phan cong danh snippets") OR ("using java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phan cong danh snippets ) or ( using java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phan cong danh snippets") or ("using java java snippets"))) or ("locating bug code snippets"))*.