Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
hanh trinh » canh tranh, hanh chinh
tran hoang » quan hoang, tran quang, tranh hang
hien xanh » hien hanh, chieu xanh, hien khanh
tran hong » tran trong, tranh hang
cong san » cong tac
san ran » san van, san roman, van ranh
ran cau » van cau, ban cau, can cau

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 ((tran hoang) or (tran hong)) cong san ran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien nhanh)) - hanh trinh ((tran hoang) OR (tran hong)) cong san ran cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) OR (hien nhanh)) - hanh trinh ((tran hoang) or (tran hong)) cong san ran cau*".