Perhaps you should try some spelling variations:
"tran quoc trinh slippers" » "tran quoc thinh slippers", "tran qua trinh slippers", "tran quy trinh slippers", "trung quoc trinh slippers", "han quoc trinh slippers", "tran duc trinh slippers", "tran quoc trinh slippery", "tran quoc trinh grippers"
"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: (((("dung java java snippets") or ("tran quoc trinh slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("tran quoc trinh slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( tran quoc trinh slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("tran quoc trinh slippers"))) or ("locating bug code snippets"))*.