Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
thong nhan » thong phan, thong quan, trong nha
hien sang » hien trang, khien bang, thien bang
tranh cua » manh cua
doanh cua » doanh luan
nhan toan » nhat toan, thanh toan, nganh toan
toan ban » van 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 ((hien sang) OR (chieu sang)) - hanh ((tranh cua) or (doanh cua)) thong thong nhan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sang) OR (chieu sang)) - hanh ((tranh cua) OR (doanh cua)) thong thong nhan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sang) OR (chieu sang)) - hanh ((tranh cua) or (doanh cua)) thong thong nhan toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sang) OR (chieu sang)) - hanh ((tranh cua) or (doanh cua)) thong thong nhan toan ban*.