Perhaps you should try some spelling variations:
"van trinh java grippers" » "van thinh java grippers", "van tinh java grippers", "dan trinh java grippers"
"using low java slippers" » "using low java slippery"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"using low java slippers\") OR (\"van trinh java grippers\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( using low java slippers ) OR ( van trinh java grippers ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using low java slippers") OR ("van trinh java grippers"))) OR ("locating bug code snippets"))*.