Perhaps you should try some spelling variations:
"tho trinh cac snippets" » "tho tinh cac snippets", "tao trinh cac snippets", "thi trinh cac snippets", "tho trinh cau snippets", "tho trinh chat snippets", "tho trinh chao 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: (((("tho trinh cac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tho trinh cac snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tho trinh cac snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tho trinh cac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.