Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"python using java snippets" » "python using data snippets"
"quan ho trac snippets" » "quan he trac snippets", "quan ha trac snippets", "quan so trac snippets", "quan hoi trac snippets", "quan pho trach snippets", "quan thi trac snippets"

Try widening your search to All Fields.

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