Perhaps you should try some spelling variations:
"dong dan trinh snippets" » "dong dan tinh snippets", "dong van trinh snippets", "dong hanh trinh snippets", "dong danh trinh snippets", "duong dan trinh snippets", "dong san trinh snippets", "dong dan trinh slippers"
"dung cfd code snippets" » "dung cho code snippets", "dung cua code snippets", "dung co 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: (((("dong dan 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: (((("dong dan trinh snippets") OR ("dung cfd code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong dan trinh snippets ) or ( dung cfd code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong dan trinh snippets") or ("dung cfd code snippets"))) or ("locating bug code snippets"))*.