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