Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
anh trong » anh thuong, dinh trong, lang trong
hoc hieu » hoc thieu, hoc hien, doc hieu
trong ca » trong cac, trong nha
ca nhung » cua nhung, cam nhung, va nhung
cong san » cong tac
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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu qua - anh trong ca nhung cong san ((tan cau) OR (van cau))~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu qua - anh trong ca nhung cong san ((tan cau) OR (van cau))*.