Perhaps you should try some spelling variations:
trinh hieu » trinh dieu, trinh thiet, trinh nhiet
nguoi viec » nguoi viet, cuoi viec, nguoi tieu
hieu suat » hieu luat, hieu qua
suat canh » luat canh, quat canh, xuat canh
cha nguoi » cua nguoi, cho nguoi, ca nguoi
canh cha » canh chau, canh cua, thanh cha
nha hoc » nha thuoc, khoa hoc, thai hoc

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 suat canh cha nguoi viec ((nha hoc) or (nha nuoc)) tieng anh~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh hieu suat canh cha nguoi viec ((nha hoc) OR (nha nuoc)) tieng anh*.