Perhaps you should try some spelling variations:
"trinh van luc snippets" » "trinh han luc snippets", "trinh quan luc snippets", "trinh toan luc snippets", "trinh van loc snippets", "trinh van duc snippets", "trinh van lu snippets", "trinh van luc 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 van luc 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 van luc snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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