Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
hieu lang » chieu sang, hieu quang, nhieu tang
cong manh » cong danh, duong manh, cong thanh
mang lan » mang lai, hang luan, bang luan
mang lam » bang lam, mang lai, mang mam
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - anh ((mang lan) or (mang lam)) phuong cong manh ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - anh ((mang lan) OR (mang lam)) phuong cong manh ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - anh ((mang lan) or (mang lam)) phuong cong manh ((toan cau) or (toan tap))*.