Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
viet tach » viet sach, viet tech, viet thanh
tong cong » trong cong, cong cong, dung cong
trinh va » trinh van, trinh vat, trinh ve
cong san » cong tac
san phan » san pham, van phan, sat phan
phan cau » phan dau, phan cac, phan tu
va tong » va thong, va tuong, va trong

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

• Performing a fuzzy search may retrieve terms with similar spellings: (hoa or khoa) viet tach - canh trinh va tong cong san phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (hoa OR khoa) viet tach - canh trinh va tong cong san phan cau.
• Adding a wildcard symbol may retrieve word variants: (hoa or khoa) viet tach - canh trinh va tong cong san phan cau*.