Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
dong thanh » truong thanh
thanh toan » thanh hoa, thanh san, tinh toan
hieu manh » chieu xanh, hieu nganh, dieu hanh
trinh cam » trinh cham, trinh tam, trinh cac
trinh cau » trinh chat, trinh chao, trinh tu
nang dong » nang song, lang dong, nang luong
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 ((thien thanh) or (hieu manh)) - canh ((trinh cam) OR (trinh cau)) nang dong thanh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien thanh) OR (hieu manh)) - canh ((trinh cam) OR (trinh cau)) nang dong thanh toan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien thanh) or (hieu manh)) - canh ((trinh cam) OR (trinh cau)) nang dong thanh toan ban*".