Perhaps you should try some spelling variations:
"trinh hoi trac snippets" » "trinh hoa trac snippets", "trinh do trac snippets", "trinh han trac snippets", "trinh hoi trach snippets", "trinh hoi tran snippets", "trinh hoi tac snippets", "trinh hoi trac 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 hoi trac 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 hoi trac snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh hoi trac snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.