Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thieu xanh » chieu xanh, hieu manh, thien anh
dong thong » thong thong, nong thon, dong thanh
hanh sinh » hanh tinh, hanh dinh, hinh sinh
thong van » trong van, thong va, thong quan
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 ((thieu xanh) OR (thien thanh)) - hanh sinh va dong thong van van ban~.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (thien thanh)) - hanh sinh va dong thong van van ban*.