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

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