Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
thieu sang » thieu khang, thieu quang, nhieu tang
chieu sang » chieu sach, chieu xanh, nhieu tang
nhung cong » dung cong, thong cong, hang cong
hieu lang » hieu quang, nhieu tang, hieu van
tuong cua » truong cua, huong cua, thong cua
cua nhung » va nhung
cong bang » cuong bang, dong bang, hong bang
bang phan » nang phan, bang nhan, bang thanh
phan cau » phan dau, phan cac, phan tu

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