Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
phan tuong » phan thuong, phan truong, phan xuong
cach thuc » anh thuc, cac thu
tuong hoc » truong hoc, tuong ho, duong hoc
van thanh » ban thanh, van tuan
thanh dat » thanh san, thanh hai, thanh van
hoc phan » hoc dan, hoc pho
tu cach » tu cac
xa thai » ca thai, da thai, xa hai
cua co » cua bo, cua cong
a thai » ca thai, da thai, y thai

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: tu cach thuc vat, nghien cua co hoc phan tuong hoc ((xa thai) OR (a thai)) van thanh dat~.
• Adding a wildcard symbol may retrieve word variants: tu cach thuc vat, nghien cua co hoc phan tuong hoc ((xa thai) or (a thai)) van thanh dat*.