Perhaps you should try some spelling variations:
"dong trieu lua slippers" » "dong trieu suat slippers", "dong trieu lit slippers", "dong trien cua slippers", "cong trieu lua slippers", "dong trieu lua slippery", "dong trieu lua 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: (((("dong trieu lua slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong trieu lua slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong trieu lua slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong trieu lua slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.