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