Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"han van dung snippets" » "han van dong snippets", "han xay dung snippets", "han tin dung snippets", "phan van dung snippets", "nhan van dung snippets", "hanh van dung snippets"

Try widening your search to All Fields.

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