Perhaps you should try some spelling variations:
"trung khoa code snippets" » "truong khoa code snippets", "trung hoa code snippets", "rung khoa code snippets", "trung khoa cong snippets", "trung khoa co snippets", "trung khoa de snippets", "trung khoa code slippers"
"dang java java snippets" » "dang va java snippets", "dang java java 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: (((("dang java java snippets") or ("trung khoa code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dang java java snippets") OR ("trung khoa code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dang java java snippets ) or ( trung khoa code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dang java java snippets") or ("trung khoa code snippets"))) or ("locating bug code snippets"))*.