Perhaps you should try some spelling variations:
"trinh quoc dat snippets" » "trinh quan dat snippets", "chinh quoc dat snippets", "trinh doc dat snippets", "trinh duoc dat snippets", "trinh quoc dan snippets", "trinh quoc danh snippets", "trinh quoc dat slippers"
"dung bug code snippets" » "dung dung code snippets", "dung hung code snippets", "dung rung code snippets", "dung bug code slippers", "dung bug core snippets"
"locating bug code snippets" » "locating bug code slippers", "locating bug core 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 quoc dat snippets") or ("dung bug code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh quoc dat snippets") OR ("dung bug code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh quoc dat snippets ) or ( dung bug code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh quoc dat snippets") or ("dung bug code snippets"))) or ("locating bug code snippets"))*.