Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
thanh toan » thanh hoa, thanh san, tinh toan
trung hoc » trung quoc
dung cong » dung trong
trang va » tran van, hang va
toan cau » toan cao, toan ban, toan tap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chi) or (theo tieu)) xanh - thanh ((trung hoc) or (trang va)) dung cong thanh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chi) OR (theo tieu)) xanh - thanh ((trung hoc) OR (trang va)) dung cong thanh toan cau.
• Adding a wildcard symbol may retrieve word variants: ((doi chi) or (theo tieu)) xanh - thanh ((trung hoc) or (trang va)) dung cong thanh toan cau*.