Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
trung tuan » trung thanh, trung tam, tran tuan
nhung dung » phuong dung, ung dung, thong dung
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung cap, dung cua
dung anh » dung danh, duong anh, dong anh
tuan cu » tuan tu, quan cua, tuan thu

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

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