Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh chua » tranh cua, trinh chuan, tranh chap
chua nang » chuc nang, chua xang, kha nang
nang cong » nang song, dang cong, bang cong
hoi hieu » hoi phieu, hoi tieu, moi hieu
ho chieu » theo chieu, hoc thieu, doi chieu
cong ban » cong bang, cong san, cong tan
than tap » toan tap, han tap, than cap
phan tap » phan lap, han tap, pha 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: ((hoi hieu) OR (ho chieu)) lang - hanh tranh chua nang cong ban ((than tap) OR (phan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoi hieu) or (ho chieu)) lang - hanh tranh chua nang cong ban ((than tap) OR (phan tap))~".
• Adding a wildcard symbol may retrieve word variants: ((hoi hieu) or (ho chieu)) lang - hanh tranh chua nang cong ban ((than tap) OR (phan tap))*.