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