Perhaps you should try some spelling variations:
thong thuong » thong thong, hang thuong, cong thuong
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
thuong han » thuong mai, thuong va, thuong gap
hieu quan » hieu qua, lieu quan, thien quan
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
than cau » toan cau, phan cau, thanh chau
than cap » khan cap, thanh lap, thanh cac

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 sang) or (hieu quan)) - thanh trung cua thong thuong han ((than cau) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu quan)) - thanh trung cua thong thuong han ((than cau) OR (than cap)).
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu quan)) - thanh trung cua thong thuong han ((than cau) or (than cap))*.