Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
trong vang » trong van, trong dang, trong tang
hien xanh » hien hanh, chieu xanh, hien khanh
dong luan » dung luan, tong luan, dong xuan
luan dung » lan dung, luan dong, luan hung
toan cao » toan ban
toan tap » toan ban
ha dong » hoat dong, van dong

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