Perhaps you should try some spelling variations:
"dong java java snippets" » "dong va java snippets"
"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"
"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: (((("dong 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: (((("dong java java snippets") OR ("cong nhan con snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong java java snippets ) or ( cong nhan con snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong java java snippets") or ("cong nhan con snippets"))) or ("locating bug code snippets"))*.