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