Perhaps you should try some spelling variations:
"canh thanh do snippets" » "canh tranh do snippets", "danh thanh do snippets", "anh thanh do snippets", "canh thanh pho snippets", "canh thanh hoa snippets", "canh thanh loi snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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: (((("canh thanh do snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("canh thanh do snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( canh thanh do snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("canh thanh do snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.