Perhaps you should try some spelling variations:
"duc thinh java snippets" » "duc trinh java snippets", "duc think java snippets", "duc thanh java snippets", "quoc thinh java snippets", "duc minh java snippets", "duc thinh java slippers"
"using _ java snippets" » "using _ java slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("using _ java snippets") or ("duc thinh java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using _ java snippets") OR ("duc thinh java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using _ java snippets ) or ( duc thinh java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using _ java snippets") or ("duc thinh java snippets"))) or ("locating bug code snippets"))*.