Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh suat » trinh luat, trinh sat, trinh quan
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hoa thiet » toan thiet, hoa viet, va thiet
thong anh » thong danh, thong lanh, hong anh
tuan cau » toan cau, quan cau, tuan cu

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: ((hoc thiet) OR (hoa thiet)) tach - hanh trinh suat thong thong anh tuan cau~.
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) or (hoa thiet)) tach - hanh trinh suat thong thong anh tuan cau*.