Perhaps you should try some spelling variations:
"trinh thi luan snippets" » "trinh tai luan snippets", "trinh thiet luan snippets", "trinh tu luan snippets", "trinh thi lan snippets", "trinh thi xuan snippets", "trinh thi loan snippets", "trinh thi luan slippers"
"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"
"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 thi luan snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("trinh thi luan snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.