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