Perhaps you should try some spelling variations:
hanh truong » hanh trong, anh truong, manh truong
thieu xanh » chieu xanh, thien anh, thien danh
truong cua » truong ca, truong quan, truong cao
nang luong » nang song
hieu manh » chieu xanh, hieu nganh, dieu hanh
cua nang » chua nang, cua dang, cua hang
bai toan » bai tap
va toan » van toan, tap toan, va thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu xanh) or (hieu manh)) - hanh truong cua nang luong ((va toan) OR (bai toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (hieu manh)) - hanh truong cua nang luong ((va toan) OR (bai toan)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (hieu manh)) - hanh truong cua nang luong ((va toan) OR (bai toan)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (hieu manh)) - hanh truong cua nang luong ((va toan) OR (bai toan)) ban*.