Perhaps you should try some spelling variations:
"quan ninh java slippers" » "quang ninh java slippers", "quan binh java slippers", "quan tinh java slippers", "quan trinh java slippers", "quan ninh java slippery", "quan ninh java grippers"
"luong cac code snippets" » "luong cuoc code snippets", "luong va code snippets", "luong tai code snippets", "luong cac cong snippets", "luong cac co snippets", "luong cac che snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code 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: (((("quan ninh java slippers") or ("luong cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("quan ninh java slippers") OR ("luong cac code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( quan ninh java slippers ) or ( luong cac code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("quan ninh java slippers") or ("luong cac code snippets"))) or ("locating bug code snippets"))*.