Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu quang » thieu quang, hieu quan, hieu qua
nhung cong » dung cong, thong cong, hang cong
trung hoc » trung quoc
hoc nhung » hoa nhung, hon nhung, nuoc nhung
cong ban » cong bang, cong san, cong tan
than cau » toan cau, phan cau, than cap
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu quang) or (chinh sach)) - thanh trung hoc nhung cong ban ((than cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu quang) OR (chinh sach)) - thanh trung hoc nhung cong ban ((than cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quang) or (chinh sach)) - thanh trung hoc nhung cong ban ((than cau) or (toan tap))*.