Perhaps you should try some spelling variations:
"using java java slippery" » "using data java slippery", "using java java slippers"
"van duong code snippets" » "van duong co snippets", "van duong cong snippets", "van duong che snippets", "van dong code snippets", "van dung code snippets", "van phong code snippets"
"locating bug core snippets" » "locating bug code snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("using java java slippery") or ("van duong code snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using java java slippery") OR ("van duong code snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( using java java slippery ) or ( van duong code snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using java java slippery") or ("van duong code snippets"))) or ("locating bug core snippets"))*.