Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"don len cong snippets" » "don len code snippets", "don den cong snippets", "don le cong snippets", "don len con snippets", "lon len cong snippets", "dung len cong snippets"
"python using data snippets" » "python using java snippets", "python using sat snippets", "python missing data snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("don len cong snippets") or ("python using data snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("don len cong snippets") OR ("python using data snippets"))) OR ("locating bug core snippets")).
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