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