Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu xanh » chieu xanh, hieu manh, thien anh
chieu tinh » trieu tinh, lieu tinh, chau tinh
dong trong » duong trong, dung trong, cong trong
trung cua » truong cua, trung tuan, trung cap
trong bai » trong ban, thong bai, trong hai
cua dong » chua dong, cua cong, cua dang
bai toan » bai tap
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 ((thieu xanh) or (chieu tinh)) - thanh trung cua dong trong bai toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (chieu tinh)) - thanh trung cua dong trong bai toan ban*.