Perhaps you should try some spelling variations:
"dung co trinh snippets" » "dung co tranh snippets", "dung cong trinh snippets", "dung tao trinh snippets", "dung cho trinh snippets", "dung cua trinh snippets", "dung co trinh slippers"
"dung cfd code snippets" » "dung cho code snippets", "dung cua code snippets", "dung cu code snippets", "dung cfd code slippers", "dung cfd core snippets"
"locating bug code snippets" » "locating bug code slippers", "locating bug core 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: (((("dung co trinh snippets") or ("dung cfd code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung co trinh snippets") OR ("dung cfd code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung co trinh snippets ) or ( dung cfd code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung co trinh snippets") or ("dung cfd code snippets"))) or ("locating bug code snippets"))*.