Perhaps you should try some spelling variations:
thuong dong » phuong dong, tuong dong, chuong dong
chieu sang » chieu sach, chieu xanh, hieu lang
trang cua » tang cua, trung cua, thang cua
tranh cua » doanh cua, manh cua
dong tac » cong tac, dong tai, dong bac
tac toan » tap toan, tam toan, hach 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 ((chieu sang) or (chinh sach)) - hanh ((trang cua) OR (tranh cua)) thuong dong tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chinh sach)) - hanh ((trang cua) OR (tranh cua)) thuong dong tac toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (chinh sach)) - hanh ((trang cua) OR (tranh cua)) thuong dong tac toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (chinh sach)) - hanh ((trang cua) OR (tranh cua)) thuong dong tac toan ban*.