Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
chieu tinh » trieu tinh, lieu tinh, chau tinh
cong manh » cong danh, duong manh, hoang manh
ho chieu » theo chieu, hoc thieu, doi chieu
tranh va » tranh van, trang va, trinh va
toan cao » toan ban
toan tap » toan ban
va nang » van nang, da nang, cam nang

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: ho chieu tinh - canh tranh va nang ((cong manh) OR (cong thanh)) ((toan cao) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu tinh - canh tranh va nang ((cong manh) OR (cong thanh)) ((toan cao) or (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: ho chieu tinh - canh tranh va nang ((cong manh) OR (cong thanh)) ((toan cao) or (toan tap))*.