Perhaps you should try some spelling variations:
"luong xuan code snippets" » "luong quan code snippets", "luong quang code snippets", "cuong quan code snippets", "luong xuan co snippets", "luong xuan code slippers"
"dong java java snippets" » "dong va java snippets", "dong java java slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("dong java java snippets") or ("luong xuan code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong java java snippets") OR ("luong xuan code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong java java snippets ) or ( luong xuan code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong java java snippets") or ("luong xuan code snippets"))) or ("locating bug code snippets"))*.