Perhaps you should try some spelling variations:
"trinh dan trong snippets" » "trinh han trong snippets", "trinh van trong snippets", "trinh san trong snippets", "trinh ban trong snippets", "trinh dat trong snippets", "trinh dao trong snippets", "trinh dan trong 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 dan trong snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("trinh dan trong snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.