Perhaps you should try some spelling variations:
"cong trinh cad snippets" » "cong trinh cau snippets", "cong trinh cac snippets", "cong trinh cam snippets"
"dung ngu java snippets" » "dung nga java snippets", "dung ngo java snippets", "dung nguoi java snippets", "dung ngu va snippets"
"locating bug code snippets" » "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: (((("dung ngu java snippets") or ("cong trinh cad snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung ngu java snippets") OR ("cong trinh cad snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung ngu java snippets ) or ( cong trinh cad snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung ngu java snippets") or ("cong trinh cad snippets"))) or ("locating bug code snippets"))*.