Perhaps you should try some spelling variations:
"using c core snippets" » "using lc core snippets", "using a core snippets", "using _ core 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"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code 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 c core snippets") or ("dung a robot snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using c core snippets") OR ("dung a robot snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using c core snippets ) or ( dung a robot snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using c core snippets") or ("dung a robot snippets"))) or ("locating bug code snippets"))*.