Perhaps you should try some spelling variations:
"dong thong code snippets" » "thong thong code snippets", "nong thon code snippets", "dong thanh code snippets", "dong thong cong snippets", "dong thong co snippets", "dong thong cad snippets"
"dung lua cau snippets" » "dung luan cau snippets", "dung luat cau snippets", "dung cua cau snippets", "dung quan cau snippets"
"locating bug code snippets" » "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: (((("dong thong code snippets") or ("dung lua cau snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong thong code snippets") OR ("dung lua cau snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong thong code snippets ) or ( dung lua cau snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong thong code snippets") or ("dung lua cau snippets"))) or ("locating bug code snippets"))*.