Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
thanh tung » thanh cong
thong than » thong thanh, thong phan, thong nhan
hieu manh » chieu xanh, hieu nganh, dieu hanh
cua thong » cua thuong, cua khong, cua tong
than toan » thanh toan, than tuan, thuat toan
toan tap » toan ban

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