Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
hanh trinh » canh tranh, hanh chinh
phuong dan » phuong danh, phuong doan, huong dan
do chinh » hoc chinh, mo hinh, do dinh
trinh va » trinh van, trinh vat, trinh ve
toan tap » toan ban
toan cao » 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: do chinh sach - hanh trinh va nhung phuong dan ((toan tap) OR (((toan cao) OR (van ban))))~.
• Adding a wildcard symbol may retrieve word variants: do chinh sach - hanh trinh va nhung phuong dan ((toan tap) or (((toan cao) or (van ban))))*.