Perhaps you should try some spelling variations:
"don thuoc cac snippets" » "dong thuoc cac snippets", "dung thuoc cac snippets", "dang thuoc cac snippets", "don thuoc cuc snippets", "don thuoc cao snippets", "don thuoc dac 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: (((("don thuoc cac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("don thuoc cac snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( don thuoc cac snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("don thuoc cac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.