Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh chuc » tranh chua, tranh cua, trang phuc
duong manh » duong van
hieu manh » chieu xanh, hieu nganh, dieu hanh
thien anh » thien danh, tien anh, thien thanh
cong manh » cong danh, cong thanh, hoang manh
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 ((hieu manh) or (thien anh)) - hanh tranh chuc nang ((cong manh) OR (duong manh)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (thien anh)) - hanh tranh chuc nang ((cong manh) OR (duong manh)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (thien anh)) - hanh tranh chuc nang ((cong manh) OR (duong manh)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (thien anh)) - hanh tranh chuc nang ((cong manh) OR (duong manh)) toan cau*.