Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
thanh tung » thanh cong
hien xanh » hien hanh, chieu xanh, hien khanh
cua nhung » va nhung
nhung con » nhung cong, nhung don, nhung mon
tung cua » trung cua, tuong cua, dung cua
la nhanh » day nhanh, nam nhanh, tai nhanh
ly nhanh » ly nhan, ly hanh, ly khanh

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)) - thanh tung cua nhung con ((la nhanh) OR (ly nhanh)) bac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien nhanh)) - thanh tung cua nhung con ((la nhanh) OR (ly nhanh)) bac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien nhanh)) - thanh tung cua nhung con ((la nhanh) OR (ly nhanh)) bac".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien nhanh)) - thanh tung cua nhung con ((la nhanh) OR (ly nhanh)) bac*.