Perhaps you should try some spelling variations:
"using hoa cong snippets" » "using hoa code snippets", "using a cong snippets", "ung hoa cong snippets", "using low cong snippets", "using cua cong snippets", "using va cong snippets", "using hoa co snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java snippets"

Try widening your search to All Fields.

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