Perhaps you should try some spelling variations:
manh truong » manh trung, manh tuong, anh truong
truong cua » truong ca, truong quan, truong cao
nhung cong » dung cong, thong cong, hang cong
cua nhung » va nhung
cong vang » cong lang, cong quang, cong ngang
hieu cac » hieu va, hieu van, vien cac
hieu luc » hieu luat, hieu qua
tan cau » toan cau, tan ca, tao cau
van cau » van dau, van hau, van chat

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 ((hieu cac) OR (hieu luc)) - manh truong cua nhung cong vang ((tan cau) OR (van cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu cac) OR (hieu luc)) - manh truong cua nhung cong vang ((tan cau) or (van cau))~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu cac) OR (hieu luc)) - manh truong cua nhung cong vang ((tan cau) or (van cau))*.