Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
thieu sang » thieu khang, thieu quang, hieu lang
chieu sang » chieu sach, chieu xanh, hieu lang
nhung cong » dung cong, thong cong, hang cong
tuong cua » truong cua, huong cua, thong cua
cua nhung » va nhung
cong sang » cong san, cong lang, cong vang
than cau » phan cau, than cap, thanh chau
toan cau » toan cao, toan ban, toan tap

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 (chieu sang)) - thanh tuong cua nhung cong sang ((than cau) OR (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (chieu sang)) - thanh tuong cua nhung cong sang ((than cau) OR (toan cau))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (chieu sang)) - thanh tuong cua nhung cong sang ((than cau) OR (toan cau))*".