Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
sinh sach » chinh sach, sinh san, sang sach
van khang » van khanh, van thanh, van quang
van hang » van hoang, van thang, ban hang
cong sat » cong suat, cong san, cong hat
sat phan » sat nhan, vat phan, xuat phan
phan lap » phan dau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sinh sach - hanh trang ((van hang) or (van khang)) cong sat phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh sach - hanh trang ((van hang) OR (van khang)) cong sat phan lap*.