Perhaps you should try some spelling variations:
trinh hieu » trinh dieu, trinh thiet, trinh nhiet
cho nguoi » cua nguoi
viet chat » viet cham, viet chau, viet nhat
qua canh » quat canh, qua danh, luat canh
ca nguoi » cua nguoi, va nguoi, con nguoi
chat hoc » chat hoa, chat thom, cho hoc
hien han » hien hanh, hien huan, dien han

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 ((ca nguoi) OR (cho nguoi)) viet chat hoc hien han~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "giao trinh hieu qua canh ((ca nguoi) OR (cho nguoi)) viet chat hoc hien han".
• Adding a wildcard symbol may retrieve word variants: giao trinh hieu qua canh ((ca nguoi) OR (cho nguoi)) viet chat hoc hien han*.