Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hieu manh » chieu xanh, hieu nganh, dieu hanh
manh dung » manh hung, manh tung, anh dung
luan dung » lan dung, luan dong, luan hung
dung tong » dung trong, dung thong, dung cong
tong tap » tuong tac, trong tan, cong tac
tap toan » tap doan, tap quan, bai toan
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 ((hieu manh) or (chieu sang)) - manh dung luan dung tong tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (chieu sang)) - manh dung luan dung tong tap toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (chieu sang)) - manh dung luan dung tong tap toan cau*.