Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hanh tran » thanh tran, hanh tram, thanh trang
nang cong » nang song, dang cong, bang cong
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
ho thiet » hoa thiet, so thiet, hoc thieu
van nang » van quang, van ban, van dong
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

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