Perhaps you should try some spelling variations:
thieu sang » thieu khang, thieu quang, hieu lang
chieu sang » chieu sach, chieu xanh, hieu lang
manh toan » thanh toan, anh tuan, tinh toan
toan tang » toan thang, toan mang, toan tong
cong van » cong vang, cong san, song van
ban cau » bang cau, ban can, van cau

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)) - manh toan ((toan tang) or (toan thong)) cong van ban cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (chieu sang)) - manh toan ((toan tang) OR (toan thong)) cong van ban cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) OR (chieu sang)) - manh toan ((toan tang) or (toan thong)) cong van ban cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) OR (chieu sang)) - manh toan ((toan tang) or (toan thong)) cong van ban cau*.