Perhaps you should try some spelling variations:
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
dong cong » duong cong, dang cong, cong cong
dung cong » dung trong
khac tai » khac trai, khau tai, khac dai
tai ban » tai san, tai ngan, tai benh

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)) - hanh tang luan ((dong cong) OR (dung cong)) khac tai ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien hanh)) - hanh tang luan ((dong cong) OR (dung cong)) khac tai ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien hanh)) - hanh tang luan ((dong cong) OR (dung cong)) khac tai ban*".