Perhaps you should try some spelling variations:
"bui khac trai nghiep cua hoc" » "bui khac trai nghiem cua hoc", "bui khac trac nghiem cua hoc", "bui khac mai nghiep cua hoc", "bui khac trai nghiep vua hoc", "bui khac trai nghiep luan hoc", "bui khac trai nghien cuu hoc", "bui nhat trai nghiep cua hoc", "bui khac trai nghiep cua hoi", "bui khac trai nghiep cua thuoc", "bui khac trai nghiep cua nuoc"
"su sach tham nghe san hoc" » "su sach nha nghe san hoc", "su sach thai nghe san hoc", "su sach pham nghe san hoc", "su sach tam nghe san hoc", "su sach tham nghe dan hoc", "su sach tham nghe sinh hoc", "su sach tham nghe va hoc", "so sach tham nghe san hoc", "vu sach tham nghe san hoc", "su sach tham nghe van hoc", "su sach tham nghe san ho"

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: (("su sach tham nghe san hoc") or ("bui khac trai nghiep cua hoc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("su sach tham nghe san hoc") OR ("bui khac trai nghiep cua hoc")).
• Removing quotes may allow a broader search: (( su sach tham nghe san hoc ) or ( bui khac trai nghiep cua hoc )).
• Adding a wildcard symbol may retrieve word variants: (("su sach tham nghe san hoc") or ("bui khac trai nghiep cua hoc"))*.