Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
hieu quang » thieu quang, hieu quan, hieu qua
chiet tach » chieu sach
thanh tung » thanh cong
cua phuong » cuu phuong, cuc phuong, luan phuong
hieu lang » chieu sang, nhieu tang, hieu van
tung cua » trung cua, tuong cua, dung cua
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban

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 (hieu quang))) or (chiet tach)) - thanh tung cua phuong cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((hieu lang) OR (hieu quang))) OR (chiet tach)) - thanh tung cua phuong cong dan toan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((hieu lang) OR (hieu quang))) or (chiet tach)) - thanh tung cua phuong cong dan toan ban*".