Perhaps you should try some spelling variations:
"dong tran hoang slippers" » "dong quan hoang slippers", "dong tran quang slippers", "dong tranh hang slippers", "dong tranh hoang slippers", "dang tran hoang slippers", "dong tren hoang slippers", "dong tran hoang slippery", "dong tran hoang 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"

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