Perhaps you should try some spelling variations:
"dung quang code snippets" » "dang quang code snippets", "luong quang code snippets", "dung luan code snippets", "dung quang de snippets", "dung quang code slippers"
"hoc cao code snippets" » "hoc cao cong snippets", "hoc cao de snippets", "hoc cfd code snippets", "hoc cao code slippers"
"locating bug code snippets" » "locating bug code slippers", "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: "((((\"hoc cao code snippets\") OR (\"dung quang code snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( hoc cao code snippets ) OR ( dung quang code snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("hoc cao code snippets") OR ("dung quang code snippets"))) OR ("locating bug code snippets"))*.