Perhaps you should try some spelling variations:
"dung dung code snippets" » "duong dung code snippets", "ung dung code snippets", "dung ung code snippets", "dung dung cong snippets", "dung dung co snippets", "dung dung de snippets", "dung dung code slippers"
"dong cac thuc snippets" » "duong cac thuc snippets", "dong bac thuc snippets", "dung cac thuc snippets", "dong cach thuc snippets", "dong cac thu snippets", "dong can thuc snippets", "dong cac thuc slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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