Perhaps you should try some spelling variations:
"dung co cong snippets" » "dung co code snippets", "dung cho cong snippets", "dung cong cong snippets", "dung cua cong snippets", "dung cao cong snippets", "dung bo cong snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung trinh java snippets" » "dung tinh java snippets", "dong trinh java snippets", "cong trinh java 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: (((("dung co cong snippets") or ("dung trinh java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung co cong snippets") OR ("dung trinh java snippets"))) OR ("locating bug core snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung co cong snippets") or ("dung trinh java snippets"))) or ("locating bug core snippets"))*.