Perhaps you should try some spelling variations:
"dai hoc trinh slippers" » "dai doc trinh slippers", "dai hoc tinh slippers", "dai hoc sinh slippers", "dai hoc trinh slippery", "dai hoc 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: (((("dai hoc 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: (((("dai hoc trinh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dai hoc trinh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dai hoc trinh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.