Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thieu xanh » chieu xanh, hieu manh, thien anh
dong tuong » dong thuong, dong thong, dong trong
tuong san » truong san, tuong sang, trong san
sinh kha » sinh khoa, sinh thai, dinh khoa
sinh ha » sinh va, tinh ha, dinh ha
san van » tan van, luan van, tran van

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 ha) OR (sinh kha)) dong tuong san van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (thien thanh)) - hanh ((sinh ha) OR (sinh kha)) dong tuong san van ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (thien thanh)) - hanh ((sinh ha) OR (sinh kha)) dong tuong san van ban*.