Perhaps you should try some spelling variations:
"trinh nhan vat snippets" » "trinh han vat snippets", "trinh phan vat snippets", "trinh nha vat snippets", "trinh nhan va snippets", "trinh nhan tai snippets", "trinh nhan dan snippets"
"dung cac che snippets" » "luong cac che snippets", "dung cho che snippets", "dung tai che snippets", "dung cac he snippets", "dung cac chien snippets", "dung cac chat 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 nhan vat snippets") or ("dung cac che snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh nhan vat snippets") OR ("dung cac che snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh nhan vat snippets ) or ( dung cac che snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh nhan vat snippets") or ("dung cac che snippets"))) or ("locating bug code snippets"))*.