Perhaps you should try some spelling variations:
hien nhanh » thien thanh, tien thanh, dien thanh
hien hanh » dieu hanh
manh tung » manh hung, thanh tung
cong vang » cong lang, cong quang, cong ngang
tung cua » trung cua, tuong cua, dung cua
cua tong » cua cong, cua dong, cua nong
song van » hoang van, trong van, duong van
toan cau » toan cao, toan ban, toan tap

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