Perhaps you should try some spelling variations:
trong mach » trong cac, trong minh, trong anh
hieu lang » chieu sang, hieu quang, nhieu tang
tang luan » dung luan
huong cua » dung cua
mach toan » manh toan, hach toan, mach tuan
hoi hieu » hoi phieu, hoi tieu, moi hieu
mang cua » manh cua, dung cua, ban cua
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: hoi hieu lang - hanh ((tang luan) or (((huong cua) or (mang cua)))) dung trong mach toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - hanh ((tang luan) OR (((huong cua) OR (mang cua)))) dung trong mach toan tap.
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - hanh ((tang luan) or (((huong cua) or (mang cua)))) dung trong mach toan tap*.