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