Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
hanh trinh » canh tranh, hanh chinh
kinh nhiem » kinh nghiem, kinh hien, binh khiem
nhiem cua » nhiet cua, nhiem chuan, nghiep cua
duoc hoc » quoc hoi
te sach » toc sach
cua hoi » cua moi
du hoc » tu hoc
thuc » thu

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thuc hanh trinh thiet ((du hoc) or (duoc hoc)) ) or ( te sach kinh nhiem cua hoi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuc hanh trinh thiet ((du hoc) OR (duoc hoc)) ) OR ( te sach kinh nhiem cua hoi )).
• Adding a wildcard symbol may retrieve word variants: (( thuc hanh trinh thiet ((du hoc) or (duoc hoc)) ) or ( te sach kinh nhiem cua hoi ))*.