Perhaps you should try some spelling variations:
"dong trinh do snippets" » "cong trinh do snippets", "dong tinh do snippets", "dong tranh do snippets", "dong trinh ky snippets"
"using cfd code snippets" » "using 3d code snippets", "using c code snippets", "using cfd core snippets"
"locating bug code snippets" » "locating bug core snippets", "locating bung code snippets", "locating bugs code snippets"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"using cfd code snippets\") OR (\"dong trinh do snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( using cfd code snippets ) OR ( dong trinh do snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using cfd code snippets") OR ("dong trinh do snippets"))) OR ("locating bug code snippets"))*.