Perhaps you should try some spelling variations:
"trinh cau code slippers" » "trinh chat code slippers", "trinh chao code slippers", "trinh tu code slippers", "trinh cau cong slippers", "trinh cau de slippers", "trinh cfd code slippers"
"dung he phi snippets" » "dung cho phi snippets", "dung he phai snippets"
"locating bug code snippets" » "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: (((("trinh cau code slippers") or ("dung he phi snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh cau code slippers") OR ("dung he phi snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh cau code slippers ) or ( dung he phi snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh cau code slippers") or ("dung he phi snippets"))) or ("locating bug code snippets"))*.