Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
hanh trung » thanh trung, hanh trang, manh trung
trung tham » trung tam, trung thanh, trung thang
nhung cong » thong cong, hang cong, nhung don
hien xanh » hien hanh, chieu xanh, hien khanh
dung cong » dung trong
ban thanh » ban hanh, ban hang
thanh cau » thanh chau, thanh mau, nhanh 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 trung tham ((nhung cong) OR (dung cong)) ban thanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien nhanh)) - hanh trung tham ((nhung cong) OR (dung cong)) ban thanh cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien nhanh)) - hanh trung tham ((nhung cong) OR (dung cong)) ban thanh cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien nhanh)) - hanh trung tham ((nhung cong) OR (dung cong)) ban thanh cau*.