Perhaps you should try some spelling variations:
thanh trung » thanh tung
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, trung cap
phan tong » phan trong, phan cong, han tong
ho chieu » theo chieu, doi chieu, mot chieu
cua phan » cua nhan, cua phap, cua han
tong ban » trong ban, tuong ban, tong van
ban toan » bai toan, ban than, van toan
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: ((ho chieu) or (hoc thieu)) tach - thanh trung cua phan tong ban toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) tach - thanh trung cua phan tong ban toan cau.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) tach - thanh trung cua phan tong ban toan cau*.