Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
hanh trinh » canh tranh, hanh chinh
dong thanh » truong thanh
hien xanh » hien hanh, chieu xanh, hien khanh
luat vung » luat chung, luat quang, luat huong
vung dong » cong dong
sang ban » nang ban, sang bae, lang ban
hang ban » hang luan, hang va, hang tai

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