Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
hien manh » tien manh, hieu manh, hien nhanh
hien hanh » dieu hanh
trinh hoa » trinh do, trinh han
vung song » vung dong, xuong song, nang song
song doan » cong doan, long doan, song don
doan phan » doanh phan, toan phan, dan phan
hoa vung » hoa ung, hoa nhung, hoa trung
phan cau » phan dau, phan cac, phan tu

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 manh) OR (hien hanh)) - canh trinh hoa vung song doan phan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien manh) OR (hien hanh)) - canh trinh hoa vung song doan phan cau*".