Perhaps you should try some spelling variations:
"dung hieu java snippets" » "dong hieu java snippets", "dung tieu java snippets", "trung hieu java snippets", "dung hieu va snippets", "dung hieu java slippers"
"cong hung code snippets" » "cong chung code snippets", "cong huong code snippets", "cong dung code snippets", "cong hung code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code 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: (((("dung hieu java snippets") or ("cong hung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung hieu java snippets") OR ("cong hung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung hieu java snippets ) or ( cong hung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung hieu java snippets") or ("cong hung code snippets"))) or ("locating bug code snippets"))*.