Perhaps you should try some spelling variations:
thuong dong » phuong dong, tuong dong, chuong dong
hieu manh » chieu xanh, hieu nganh, dieu hanh
thien anh » thien danh, tien anh, thien thanh
thai tinh » thai binh, thai vinh, thanh 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 ((hieu manh) or (thien anh)) - thai tinh va thuong dong van than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (thien anh)) - thai tinh va thuong dong van than tap*.