Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, hieu quan
trien quang » tran quang, tuyen quang, dien quang
trung cong » truong cong, trong cong, trung uong
danh thanh » dinh thanh, dang thanh, nhanh thanh
tranh cua » doanh cua, manh cua
cua trung » cua truong, xuan trung, cua nhung
dan thanh » dang thanh, ban thanh, van thanh

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

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