Perhaps you should try some spelling variations:
nhung huong » nhung phuong, nhung cong, nhung dung
nhung tuong » nhung phuong, hung vuong, nhung cong
chieu sang » chieu sach, chieu xanh, hieu lang
thanh tung » thanh cong
hieu quan » hieu qua, lieu quan, thien quan
tung cua » trung cua, tuong cua, dung cua
san tap » han tap, man tap, san tay

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 quan) or (chieu sang)) - thanh tung cua ((nhung tuong) OR (nhung huong)) thanh san tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu quan) OR (chieu sang)) - thanh tung cua ((nhung tuong) OR (nhung huong)) thanh san tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu quan) or (chieu sang)) - thanh tung cua ((nhung tuong) OR (nhung huong)) thanh san tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu quan) or (chieu sang)) - thanh tung cua ((nhung tuong) OR (nhung huong)) thanh san tap*.