Perhaps you should try some spelling variations:
nhung phuong » nhu phuong, truong phuong, bang phuong
dung phuong » dung thuong, bang phuong, dung chung
chieu sach » chinh sach, chiet tach, chieu sang
hanh trinh » canh tranh, hanh chinh
doi chieu » doc hieu, doi chi, ho chieu
trinh va » trinh van, trinh vat, trinh ve
toan tai » toan tap, doanh tai, toan ban
toan cao » toan ban, toan tap

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: doi chieu sach - hanh trinh va ((nhung phuong) OR (dung phuong)) danh ((toan tai) OR (toan cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - hanh trinh va ((nhung phuong) OR (dung phuong)) danh ((toan tai) or (toan cao))~".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh trinh va ((nhung phuong) OR (dung phuong)) danh ((toan tai) or (toan cao))*.