Perhaps you should try some spelling variations:
truong cua » truong ca, truong quan, truong cao
trong mach » trong cac, trong minh, trong anh
trung cua » trung tuan, trung cap, dung cua
mach toan » manh toan, hach toan, mach tuan
khi tinh » khoi tinh, khi sinh, kho tinh
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi khi tinh - thanh ((trung cua) or (truong cua)) dung trong mach toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi khi tinh - thanh ((trung cua) OR (truong cua)) dung trong mach toan cau.
• Adding a wildcard symbol may retrieve word variants: doi khi tinh - thanh ((trung cua) or (truong cua)) dung trong mach toan cau*.