Perhaps you should try some spelling variations:
"tran thien c snippets" » "tran hien c snippets", "tran chien c snippets", "tran tien c snippets", "tran thien _ snippets", "tran thien loc snippets", "tran thien cac snippets"
"python using java snippets" » "python using data snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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