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