Perhaps you should try some spelling variations:
thieu quang » thien quan, trien quang, hieu quan
nhung cuong » nhung cong, hung cuong, nhung chong
hieu quang » hieu quan, hieu qua, diep quang
trung tuan » trung thanh, trung tam, tran tuan
cuong dung » tuong duong, ung dung, thong dung
dung thanh » duong thanh, dong thanh, dang thanh
trung cua » truong cua, trung cap, dung cua
thanh van » thanh san, thanh toan, thanh phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu quang) OR (thieu quang)) - hanh ((trung cua) or (trung tuan)) nhung cuong dung thanh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu quang) OR (thieu quang)) - hanh ((trung cua) OR (trung tuan)) nhung cuong dung thanh van.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu quang) OR (thieu quang)) - hanh ((trung cua) or (trung tuan)) nhung cuong dung thanh van".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu quang) OR (thieu quang)) - hanh ((trung cua) or (trung tuan)) nhung cuong dung thanh van*.