Perhaps you should try some spelling variations:
"dung cuu chong snippets" » "dung cuu cong snippets", "dung cuu phong snippets", "dung cuu phuong snippets", "dung cua chong snippets", "dung cu chong snippets", "dung cau chong snippets"
"hang java java snippets" » "hang 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.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung cuu chong snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung cuu chong snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung cuu chong snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung cuu chong snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.