Perhaps you should try some spelling variations:
"trinh nhap doanh snippets" » "trinh nha doanh snippets", "trinh phap doanh snippets", "trinh han doanh snippets", "trinh nhuan doanh snippets", "trinh lap doanh snippets", "trinh nhap doanh slippers"
"dung cho code snippets" » "dung cho cong snippets", "dung cfd code snippets", "dung cho con snippets", "dung cho 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: (((("trinh nhap doanh snippets") or ("dung cho code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh nhap doanh snippets") OR ("dung cho code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh nhap doanh snippets ) or ( dung cho code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh nhap doanh snippets") or ("dung cho code snippets"))) or ("locating bug code snippets"))*.