Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh luan » trinh luat, trinh quan, trinh han
dong huong » dong thuong, dong duong, cong huong
duoc gian » duoc giao, duong gian, quoc gia
luan dong » luan cong, quan dong, luan nong
gian dan » gian lang
toan tai » toan tap, doanh tai, toan ban

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: duoc gian dan - hanh trinh luan dong huong dan ((toan tai) OR (van ban))~.
• Adding a wildcard symbol may retrieve word variants: duoc gian dan - hanh trinh luan dong huong dan ((toan tai) or (van ban))*.