Perhaps you should try some spelling variations:
"trinh tu code snippets" » "trinh ky code snippets", "trinh do code snippets", "trinh tu code slippers"
"dung cua duc snippets" » "dung luan duc snippets", "dung cho duc snippets", "dung cua tuc snippets", "dung cua nuoc snippets", "dung cua quoc snippets", "dung cua duc 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: (((("trinh tu code snippets") or ("dung cua duc snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh tu code snippets") OR ("dung cua duc snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh tu code snippets ) or ( dung cua duc snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh tu code snippets") or ("dung cua duc snippets"))) or ("locating bug code snippets"))*.