Perhaps you should try some spelling variations:
hoc thuyet » hoc chuyen
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
ho chiet » ho chieu, ho thiet, hoc thiet
cong san » cong tac
san tuan » van tuan, san luan, san quan
tuan cau » toan cau, quan cau, tuan cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chiet) or (hoc thuyet)) tach - ((thanh trung) or (thanh tung)) va nhung cong san tuan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chiet) OR (hoc thuyet)) tach - ((thanh trung) OR (thanh tung)) va nhung cong san tuan cau.
• Adding a wildcard symbol may retrieve word variants: ((ho chiet) or (hoc thuyet)) tach - ((thanh trung) or (thanh tung)) va nhung cong san tuan cau*.