Perhaps you should try some spelling variations:
trinh hieu » trinh dieu, trinh thiet, trinh nhiet
viet theo » viet tien, viet thuc, viet tiep
hien hanh » dieu hanh
qua canh » quat canh, qua danh, luat canh
va nguoi » ca nguoi, cua nguoi, dao nguoi
viet cho » viec cho, viet co, viet cham
canh va » canh van, hanh va, anh va

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

• Performing a fuzzy search may retrieve terms with similar spellings: giao trinh hieu qua canh va nguoi ((viet cho) or (viet theo)) hoc hien hanh~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh hieu qua canh va nguoi ((viet cho) OR (viet theo)) hoc hien hanh.
• Adding a wildcard symbol may retrieve word variants: giao trinh hieu qua canh va nguoi ((viet cho) or (viet theo)) hoc hien hanh*.