Perhaps you should try some spelling variations:
trinh xuat » trinh luat, trinh xuan, trich xuat
tranh luan » trinh luan, trinh luat, doanh luan
hieu lang » chieu sang, hieu quang, nhieu tang
hang nong » thang long, han tong
nong manh » nong lanh, duong manh, hoang manh
doc hieu » toc thieu, hoc thieu, hoc hien
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu lang - canh ((trinh xuat) or (tranh luan)) hang nong manh ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - canh ((trinh xuat) OR (tranh luan)) hang nong manh ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - canh ((trinh xuat) or (tranh luan)) hang nong manh ((toan cau) or (toan tap))*.