Perhaps you should try some spelling variations:
"giang thuc cach snippets" » "giang thuc code snippets", "gia thuc cach snippets", "gian thua cach snippets", "giang thi cach snippets", "giang thuoc sach snippets", "giang truoc cach snippets", "giang thuc hanh 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: (((("giang thuc cach snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("giang thuc cach snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
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