Perhaps you should try some spelling variations:
"dung san data snippets" » "dung a data snippets", "dung dan dat snippets", "dung ban dat snippets", "dong san data snippets", "dung sai data snippets", "dung luan data snippets", "dung san data 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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