Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu quang » thieu quang, hieu quan, hieu qua
hieu lang » chieu sang, nhieu tang, hieu van
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
thong san » thong sang, trong san, thong van
thanh cac » thanh bac, thanh ca, tranh cac
hanh cac » hang cac, hanh cat, nhanh cay

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quang)) - thanh trung cua thong thong san ((thanh cac) OR (hanh cac))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) OR (hieu quang)) - thanh trung cua thong thong san ((thanh cac) or (hanh cac))~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) OR (hieu quang)) - thanh trung cua thong thong san ((thanh cac) or (hanh cac))*.