Perhaps you should try some spelling variations:
"dong chen cuu snippets" » "dong chan cuu snippets", "dong che cuu snippets", "dong chuyen cuu snippets", "dong nghen cuu snippets", "dong cham cuu snippets", "dong chen yu snippets"
"dung java java snippets" » "dung 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: (((("dong chen cuu snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong chen cuu snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong chen cuu snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong chen cuu snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.