Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
van thanh » ban thanh, van tuan
hanh hoc » thanh hoc, hinh hoc, anh hoc
cong coc » cong cuoc, cong cac, cong co
coc toan » ngoc toan, coc khoan, quoc toan
khoa hoc » hoa hoc
van nhan » van phan, danh nhan, van khanh
tu hanh » du hanh, lu hanh, thuc hanh
dan moi » ban moi, dai moi, dan hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu hanh hoc tap, nghien thu cong coc toan khoa hoc dan moi ((van nhan) or (van thanh)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu hanh hoc tap, nghien thu cong coc toan khoa hoc dan moi ((van nhan) OR (van thanh)) van.
• Adding a wildcard symbol may retrieve word variants: tu hanh hoc tap, nghien thu cong coc toan khoa hoc dan moi ((van nhan) or (van thanh)) van*.