Perhaps you should try some spelling variations:
"khanh van trinh snippets" » "thanh van trinh snippets", "khanh vinh trinh snippets", "hanh va trinh snippets", "khanh van thinh snippets", "khanh van tinh snippets", "khanh dan trinh snippets", "khanh van trinh 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: (((("khanh van trinh snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khanh van trinh snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("khanh van trinh snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.