Perhaps you should try some spelling variations:
"dong trinh code snippets" » "cong trinh code snippets", "dong tinh code snippets", "dong tranh code snippets", "dong trinh cong snippets", "dong trinh co snippets", "dong trinh cad snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug core snippets" » "locating bug code 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 trinh code snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"dong trinh code snippets\") OR (\"dung java java snippets\"))) OR (\"locating bug core snippets\"))".
• Removing quotes may allow a broader search: (((( dong trinh code snippets ) OR ( dung java java snippets ))) OR ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong trinh code snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets"))*.