Perhaps you should try some spelling variations:
sanh trinh » hanh trinh, anh trinh, sinh trinh
trinh thuc » trinh tu, trinh thi
phau thong » phap thong, khau thong, phan thong
khoan nuoi » khoan nhoi, chan nuoi, khoa noi
nuoi trong » nuoc trong, ngoai trong, bui trong
thuc hang » thuc hanh, thu hang, phuc hang
hang khoa » dung khoa
khoa phau » hoa phan, khoa kham, khoa than
tai thuc » thai thuc, tri thuc, dai thuc
thuc cac » thuc cach, tuc cac, phuc cac
so sanh » do sanh
anh tai » hanh tai, anh thai, vanh tai
so anh » so danh, do anh, ho anh

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: (( so sanh trinh thuc hang khoa phau thong ) OR ( so anh tai thuc cac khoan nuoi trong ))~.
• Adding a wildcard symbol may retrieve word variants: (( so sanh trinh thuc hang khoa phau thong ) or ( so anh tai thuc cac khoan nuoi trong ))*.