Perhaps you should try some spelling variations:
"trinh cau dang snippets" » "trinh chat dang snippets", "trinh chao dang snippets", "trinh tu dang snippets", "trinh cao dang snippets", "trinh cac dang snippets", "trinh cau danh snippets"
"dung dung de snippets" » "duong dung de snippets", "ung dung de snippets", "dung ung de snippets", "dung dung he snippets", "dung dung dat snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("trinh cau dang snippets") or ("dung dung de snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh cau dang snippets") OR ("dung dung de snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh cau dang snippets ) or ( dung dung de snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh cau dang snippets") or ("dung dung de snippets"))) or ("locating bug code snippets"))*.