Perhaps you should try some spelling variations:
"cong nhan con snippets" » "cong nhat con snippets", "cong thanh con snippets", "cong san con snippets", "cong nhan co snippets", "cong nhanh cong snippets", "cong phan cong snippets"
"anh java java snippets" » "anh va java 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: (((("anh java java snippets") or ("cong nhan con snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("anh java java snippets") OR ("cong nhan con snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( anh java java snippets ) or ( cong nhan con snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("anh java java snippets") or ("cong nhan con snippets"))) or ("locating bug code snippets"))*.