Perhaps you should try some spelling variations:
trong mach » trong cac, trong minh, trong anh
trinh cua » trinh luat, trinh quan, trinh luan
mach toan » manh toan, hach toan, mach tuan
nhu hieu » nhu hien, nha hieu, nhu dieu
nho hieu » nha hieu, nho sieu, nghe hieu
tinh cua » sinh cua, tinh chat, tranh cua
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((nhu hieu) or (nho hieu)) lang - hanh ((trinh cua) or (tinh cua)) dung trong mach toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((nhu hieu) OR (nho hieu)) lang - hanh ((trinh cua) OR (tinh cua)) dung trong mach toan ban.
• Adding a wildcard symbol may retrieve word variants: ((nhu hieu) or (nho hieu)) lang - hanh ((trinh cua) or (tinh cua)) dung trong mach toan ban*.