Perhaps you should try some spelling variations:
"duong dan code snippets" » "duong dang code snippets", "huong dan code snippets", "duong van code snippets", "duong dan de snippets", "duong dan code slippers"
"trinh cau code snippets" » "trinh chat code snippets", "trinh chao code snippets", "trinh tu code snippets", "trinh cau cong snippets", "trinh cau de snippets", "trinh cfd code snippets", "trinh cau 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.

You may be able to get more results by adjusting your search query.

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