Perhaps you should try some spelling variations:
"toc trinh java snippets" » "doc trinh java snippets", "hoc trinh java snippets", "tra trinh java snippets"
"using low java slippers" » "using low java slippery", "using low java grippers"
"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.

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