Perhaps you should try some spelling variations:
phuong doan » phuong loan, phuong hoang, huong dan
chieu sach » chinh sach, chiet tach, chieu sang
phuong dan » phuong danh, huong dan, phuong lan
doi chieu » doc hieu, doi chi, ho chieu
trung cua » truong cua, trung tuan, trung cap
tang cua » mang cua, hang cua, tang luan
toan cau » 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 ((trung cua) OR (tang cua)) nhung ((phuong dan) OR (phuong doan)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - hanh ((trung cua) or (tang cua)) nhung ((phuong dan) OR (phuong doan)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh ((trung cua) or (tang cua)) nhung ((phuong dan) OR (phuong doan)) toan cau*.