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