Perhaps you should try some spelling variations:
"hieu quang java slippers" » "thieu quang java slippers", "hieu quan java slippers", "hieu qua java slippers", "hieu quang va slippers", "hieu quang java slippery", "hieu quang java 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: (((("hieu quang java slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hieu quang java slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hieu quang java slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hieu quang java slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.