Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
nhung dong » nhung don, nhung cong, nhung dung
dong thanh » truong thanh
hien xanh » hien hanh, chieu xanh, hien khanh
thanh va » thanh van, hanh va, thanh ha
trang va » tran van, hang va
pho cau » pho cap, pha cau, pho cam

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