Perhaps you should try some spelling variations:
"dung anh thuc snippets" » "dung danh thuc snippets", "duong anh thuc snippets", "dong anh thuc snippets", "dung am thuc snippets", "dung dan thuc snippets", "dung anh tu snippets", "dung anh thuc slippers"
"dung cfd code snippets" » "dung cho code snippets", "dung cua code snippets", "dung co code snippets", "dung cfd code slippers", "dung cfd core snippets"
"locating bug code snippets" » "locating bug code slippers", "locating bug core snippets", "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 anh thuc snippets") or ("dung cfd code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung anh thuc snippets") OR ("dung cfd code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung anh thuc snippets") or ("dung cfd code snippets"))) or ("locating bug code snippets"))*.