Perhaps you should try some spelling variations:
"thi trinh code snippets" » "thi trinh cong snippets", "thi trinh co snippets", "thi trinh cad snippets", "tho trinh code snippets", "thi thanh code snippets", "thi minh code 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"dung java java snippets\") OR (\"thi trinh code snippets\"))) OR (\"locating bug core snippets\"))~".
• Removing quotes may allow a broader search: (((( dung java java snippets ) OR ( thi trinh code snippets ))) OR ( locating bug core snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") OR ("thi trinh code snippets"))) OR ("locating bug core snippets"))*.