Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu qua, diep quang
thanh tung » thanh cong
thpt nhung » thpt hung, thuat nhung, thi nhung
nhung cong » dung cong, thong cong, hang cong
cong thanh » dong thanh, cong trinh, cong tan
hieu quan » hieu qua, lieu quan, thien quan
tung thpt » truong thpt
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: nho ((hieu quang) OR (hieu quan)) - thanh tung thpt nhung cong thanh ((toan tap) or (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nho ((hieu quang) OR (hieu quan)) - thanh tung thpt nhung cong thanh ((toan tap) OR (van ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "nho ((hieu quang) OR (hieu quan)) - thanh tung thpt nhung cong thanh ((toan tap) or (van ban))".
• Adding a wildcard symbol may retrieve word variants: nho ((hieu quang) OR (hieu quan)) - thanh tung thpt nhung cong thanh ((toan tap) or (van ban))*.