Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
chieu sang » chieu sach, chieu xanh, hieu lang
thanh tung » thanh cong
va phuong » va thuong, cac phuong
ho chieu » theo chieu, hoc thieu, doi chieu
tap toan » tap doan, tap quan
bai toan » bai tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sang - ((thanh trung) or (thanh tung)) va phuong cong ((tap toan) OR (bai toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - ((thanh trung) OR (thanh tung)) va phuong cong ((tap toan) OR (bai toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sang - ((thanh trung) or (thanh tung)) va phuong cong ((tap toan) OR (bai toan)) cao".
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - ((thanh trung) or (thanh tung)) va phuong cong ((tap toan) OR (bai toan)) cao*.