Perhaps you should try some spelling variations:
"trinh hoa trinh snippets" » "trinh do trinh snippets", "trinh han trinh snippets", "trinh hoa tinh snippets", "trinh hoa thinh snippets", "trinh hoc trinh snippets", "trinh hoa trinh 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 hoa trinh snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh hoa trinh snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh hoa trinh snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.