Perhaps you should try some spelling variations:
"hanh cac trinh snippets" » "hanh cac tinh snippets", "hanh lap trinh snippets", "hanh cac thanh snippets", "hang cac trinh snippets", "hanh cat trinh snippets", "nhanh cay trinh snippets", "hanh cac trinh slippers"
"dung cho code snippets" » "dung cho cong snippets", "dung cfd code snippets", "dung cho con snippets", "dung cho 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: (((("hanh cac trinh snippets") or ("dung cho code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hanh cac trinh snippets") OR ("dung cho code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hanh cac trinh snippets ) or ( dung cho code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hanh cac trinh snippets") or ("dung cho code snippets"))) or ("locating bug code snippets"))*.