Perhaps you should try some spelling variations:
"dung sat trach snippets" » "duong sat trach snippets", "dung dat trach snippets", "dung sai trach snippets", "dung sat trich snippets", "dung sat tranh snippets", "dung sat trach slippers"
"dung cau code snippets" » "dung chau code snippets", "dung cu code snippets", "dung cac code snippets", "dung cau cong snippets", "dung cau de snippets", "dung cfd code snippets", "dung cau code 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 sat trach snippets") or ("dung cau code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung sat trach snippets") OR ("dung cau code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung sat trach snippets") or ("dung cau code snippets"))) or ("locating bug code snippets"))*.