Perhaps you should try some spelling variations:
"lan tranh co snippets" » "lanh tranh co snippets", "luan tranh co snippets", "can tranh co snippets", "lan trinh co snippets", "lan tranh o snippets", "lan tranh cuoc snippets"
"dung java java snippets" » "dung 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: (((("lan tranh co snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("lan tranh co snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( lan tranh co snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("lan tranh co snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.