Perhaps you should try some spelling variations:
"trinh luan dat snippets" » "trinh luat dat snippets", "trinh quan dat snippets", "trinh han dat snippets", "trinh luan dac snippets", "trinh luan day snippets"
"dung trong co snippets" » "dung trong ca snippets", "dung trong cong snippets", "dung trong cuoc 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: (((("trinh luan dat snippets") or ("dung trong co snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh luan dat snippets") OR ("dung trong co snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh luan dat snippets ) or ( dung trong co snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh luan dat snippets") or ("dung trong co snippets"))) or ("locating bug code snippets"))*.