Perhaps you should try some spelling variations:
thuong dong » phuong dong, tuong dong, chuong dong
thien thanh » tien thanh, thi thanh, hien hanh
thieu xanh » chieu xanh, hieu manh, thien anh
than tinh » thanh tinh, than kinh, thai tinh
dong van » duong van, dang van, dong von
van than » van thanh, van thang, van tuan
than tap » toan tap, han tap, phan tap
tinh va » tich va, trinh van, trinh vat

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 (thien thanh)) - than tinh va thuong dong van than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (thien thanh)) - than tinh va thuong dong van than tap*.