Perhaps you should try some spelling variations:
"o giai chieu snippets" » "o giai code snippets", "o gioi thieu snippets", "o gian hieu snippets", "o gia hieu snippets", "so giai chieu snippets", "ro giai chieu snippets", "o gia chieu snippets"
"locating bug core snippets" » "locating bug code snippets"
"python using data snippets" » "python using java snippets", "python using sat snippets", "python missing data snippets"

Try widening your search to All Fields.

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