Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
hieu manh » chieu xanh, hieu nganh, hien hanh
dung cong » dung trong
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
tang cua » mang cua, hang cua, tang luan
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 (dieu hanh)) - hanh ((tang cua) or (trung tuan)) dung cong manh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (dieu hanh)) - hanh ((tang cua) OR (trung tuan)) dung cong manh toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) OR (dieu hanh)) - hanh ((tang cua) or (trung tuan)) dung cong manh toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) OR (dieu hanh)) - hanh ((tang cua) or (trung tuan)) dung cong manh toan cau*.