Perhaps you should try some spelling variations:
truong cong » trong cong, truong dong, truong long
chieu xanh » chieu sach, chieu sang, chieu tinh
thuong con » thuong dong, thong cong, thuong chi
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
tinh cao » tinh lao, tinh chat, tinh cach
bai toan » bai tap
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: ho ((chieu xanh) or (chinh sach)) - hanh tinh cao ((thuong con) OR (truong cong)) bai toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu xanh) OR (chinh sach)) - hanh tinh cao ((thuong con) OR (truong cong)) bai toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu xanh) or (chinh sach)) - hanh tinh cao ((thuong con) OR (truong cong)) bai toan tap".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (chinh sach)) - hanh tinh cao ((thuong con) OR (truong cong)) bai toan tap*.