Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
dong tuong » dong thuong, dong thong, dong trong
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh sinh » hanh tinh, hanh dinh, hinh sinh
tuong van » truong van, trong van, duong van
sinh va » sinh vat, tinh va, dinh van
va dong » van dong, ha dong, xa dong
van van » tan van, san van, van vat

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (thien thanh)) - hanh sinh va dong tuong van van ban~.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (thien thanh)) - hanh sinh va dong tuong van van ban*.