Perhaps you should try some spelling variations:
"using cfd code snippets" » "using 3d code snippets", "using c code snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung a robot snippets" » "dung _ robot snippets", "dung tao robot snippets", "dung tay robot snippets", "dung va robot snippets", "dung ha robot snippets", "dung ai robot snippets"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("using cfd code snippets") OR ("dung a robot snippets"))) OR ("locating bug core snippets"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"using cfd code snippets\") OR (\"dung a robot snippets\"))) OR (\"locating bug core snippets\"))".
• Removing quotes may allow a broader search: (((( using cfd code snippets ) OR ( dung a robot snippets ))) OR ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using cfd code snippets") OR ("dung a robot snippets"))) OR ("locating bug core snippets"))*.