Perhaps you should try some spelling variations:
"duc van thinh snippets" » "duc van thanh snippets", "duc van chinh snippets", "duc van minh snippets", "duc va thinh snippets", "duc tan thinh snippets", "duc manh thinh snippets", "duc van thinh slippers"
"python using a snippets" » "python using a slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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