Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
trinh luan » trinh luat, trinh quan, trinh han
luan chung » luan chinh
chung dong » chuong dong, chuong duong, phuong dong
khi xanh » khia canh, thi hanh, thi anh
dong bac » dong bang, dong luc, dong hoc
bac toan » bai toan, bao toan, hach toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi khi xanh - canh trinh luan chung dong bac toan cau~.
• Adding a wildcard symbol may retrieve word variants: doi khi xanh - canh trinh luan chung dong bac toan cau*.