Perhaps you should try some spelling variations:
"trinh toan code snippets" » "tinh toan code snippets", "thanh toan code snippets", "trinh han code snippets", "trinh toan co snippets", "trinh toan cong snippets", "trinh toan de snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung co code snippets" » "dung cho code snippets", "dung cong code snippets", "dung cua code snippets", "dung cfd 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 toan code snippets") or ("dung co code snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh toan code snippets") OR ("dung co code snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( trinh toan code snippets ) or ( dung co code snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh toan code snippets") or ("dung co code snippets"))) or ("locating bug core snippets"))*.