Perhaps you should try some spelling variations:
"tung dan de snippets" » "dung dan de snippets", "huong dan de snippets", "trung dai de snippets", "tung dan den snippets", "tung dang de snippets", "tung van de snippets"
"using c code snippets" » "using lc code snippets", "using a code snippets", "using _ code snippets", "using cfd code 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.

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