Perhaps you should try some spelling variations:
"truong thanh code snippets" » "truong trung code snippets", "truong thpt code snippets", "truong chung code snippets", "truong thanh cong snippets", "truong thanh de snippets", "truong thanh code slippers"
"dung co code snippets" » "dung cho code snippets", "dung cong code snippets", "dung cua code snippets", "dung cfd code snippets", "dung co code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung co code snippets") or ("truong thanh code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung co code snippets") OR ("truong thanh code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung co code snippets ) or ( truong thanh code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung co code snippets") or ("truong thanh code snippets"))) or ("locating bug code snippets"))*.