Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
chieu tinh » trieu tinh, lieu tinh, chau tinh
truong cua » truong ca, truong quan, truong cao
dung cuong » dung cong, dung luong, dang cuong
trung cua » trung tuan, trung cap, dung cua
cuong bai » uong bi, cuong ma
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: hoc ((thieu xanh) or (chieu tinh)) - thanh ((trung cua) OR (truong cua)) dung cuong bai toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (chieu tinh)) - thanh ((trung cua) OR (truong cua)) dung cuong bai toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (chieu tinh)) - thanh ((trung cua) OR (truong cua)) dung cuong bai toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (chieu tinh)) - thanh ((trung cua) OR (truong cua)) dung cuong bai toan tap*.