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