Perhaps you should try some spelling variations:
"dong tranh cuu snippets" » "dong thanh cuu snippets", "dong trinh cuu snippets", "trong tranh cuu snippets", "dong tranh cua snippets", "dong tranh chua 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"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("dong tranh cuu snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong tranh cuu snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong tranh cuu snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong tranh cuu snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.