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