Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
trung cap » truong cao, trung tam
nang cong » dang cong, bang cong, hang cong
doan hang » doan hung, doan quang, toan thang
hang dau » 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 hanh)) - thanh trung cap ((nang cong) OR (nang song)) doan hang dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien hanh)) - thanh trung cap ((nang cong) OR (nang song)) doan hang dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien hanh)) - thanh trung cap ((nang cong) OR (nang song)) doan hang dau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien hanh)) - thanh trung cap ((nang cong) OR (nang song)) doan hang dau*.