Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
tranh cua » doanh cua, manh cua
cua trong » cua truong, cua trung, qua trong
tan toan » tan tran, van toan, dan toan
tap toan » tap doan, tap quan, bai toan

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) or (hien hanh)) - hanh tranh cua trong cong ((tan toan) OR (tap toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien hanh)) - hanh tranh cua trong cong ((tan toan) OR (tap toan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien hanh)) - hanh tranh cua trong cong ((tan toan) OR (tap toan)) tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien hanh)) - hanh tranh cua trong cong ((tan toan) OR (tap toan)) tap*.