Perhaps you should try some spelling variations:
quan trong » gian trong
hien nhanh » thien thanh, tien thanh, dien thanh
hien xanh » chieu xanh, hien khanh, khien canh
hien hanh » dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
tang quan » tang luan, nang quan, tong quan
cong van » cong vang, cong san, song van
van tan » van tuan, van ban, van tai
tan cau » toan cau, van cau, tan ca

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) OR (hien hanh)))) - hanh tang quan trong cong van tan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (((hien nhanh) OR (hien hanh)))) - hanh tang quan trong cong van tan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (((hien nhanh) OR (hien hanh)))) - hanh tang quan trong cong van tan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (((hien nhanh) OR (hien hanh)))) - hanh tang quan trong cong van tan cau*.