Perhaps you should try some spelling variations:
"trinh dan chan snippets" » "trinh han chan snippets", "trinh van chan snippets", "trinh san chan snippets", "trinh dan gian snippets", "trinh dan ca snippets", "trinh van chat snippets"
"dung cac code snippets" » "luong cac code snippets", "dung cho code snippets", "dung tai code snippets", "dung cac cong snippets", "dung cac co snippets", "dung cac che 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: "((((\"trinh dan chan snippets\") OR (\"dung cac code snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( trinh dan chan snippets ) OR ( dung cac code snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("trinh dan chan snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets"))*.