Perhaps you should try some spelling variations:
"canh tranh cho snippets" » "canh trinh cho snippets", "canh trang cho snippets", "canh tranh co snippets", "anh tranh cho snippets", "can tranh cho snippets", "hanh tranh cho snippets"
"dung java java snippets" » "dung va java 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: (((("canh tranh cho snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("canh tranh cho snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( canh tranh cho snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("canh tranh cho snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.