Perhaps you should try some spelling variations:
"trinh viet thin snippets" » "ninh viet thin snippets", "trinh vat thin snippets", "trinh viet thinh snippets", "trinh viet nhin snippets", "trinh viet thanh snippets", "trinh viet thin slippers"
"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"
"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: (((("trinh viet thin snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh viet thin snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh viet thin snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.