Perhaps you should try some spelling variations:
hien xanh » hien hanh, hien nhanh, chieu xanh
tang luan » dung luan
dung cong » dung trong
tang cua » mang cua, hang cua, thong cua
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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