Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
tong cong » trong cong, cong cong, dung cong
cua tinh » cua sinh, va tinh, ha tinh
trinh va » trinh van, trinh vat, trinh ve
cong dan » cong san, cong tan, huong dan
than cau » phan cau, than cap, thanh chau
toan cau » toan cao, toan ban, toan tap
va sinh » va kinh, va tinh, vi sinh
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: moc ((cua tinh) or (va sinh)) - canh trinh va tong cong dan ((than cau) OR (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: moc ((cua tinh) OR (va sinh)) - canh trinh va tong cong dan ((than cau) OR (toan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "moc ((cua tinh) or (va sinh)) - canh trinh va tong cong dan ((than cau) OR (toan cau))".
• Adding a wildcard symbol may retrieve word variants: moc ((cua tinh) or (va sinh)) - canh trinh va tong cong dan ((than cau) OR (toan cau))*.