Perhaps you should try some spelling variations:
"dung dung code snippets" » "duong dung code snippets", "ung dung code snippets", "dung ung code snippets", "dung dung cong snippets", "dung dung co snippets", "dung dung de snippets", "dung dung code slippers"
"trinh he tao snippets" » "trinh han tao snippets", "trinh hoa tao snippets", "trinh ky tao snippets", "trinh che tao snippets", "trinh de tao snippets", "trinh he cao snippets", "trinh he tao slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("trinh he tao snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("trinh he tao snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.