Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
tuong tong » tuong tuong, tuong dong, thuong trong
hien xanh » hien hanh, hien nhanh, chieu xanh
trinh cua » tinh cua, trinh luat, trinh quan
cua tuong » cua truong, cua thuong, cua huong
tap toan » tap doan, bai toan
tap quan » tac quan, hai quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien xanh - hanh trinh cua tuong tong ((tap toan) or (tap quan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh trinh cua tuong tong ((tap toan) OR (tap quan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc hien xanh - hanh trinh cua tuong tong ((tap toan) or (tap quan)) cau*.