Perhaps you should try some spelling variations:
"nhan hoc cong snippets" » "nhan hoc code snippets", "nha hoc cong snippets", "nhan hoa cong snippets", "than hoc cong snippets", "nhan hoc co snippets", "nhan cac cong snippets", "nhan hoc dung snippets"
"locating bug core snippets" » "locating bug code snippets"
"python using sat snippets" » "python using data snippets", "python using a snippets", "python using raw snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("python using sat snippets") or ("nhan hoc cong snippets"))) or ("locating bug core snippets"))~.
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