Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
quan nhung » qua nhung, cua nhung, luan chung
hieu sach » chieu sach, dien sach, hieu cac
hieu cach » hieu cac, chieu sach, hieu ca
cach tuan » mach tuan, anh tuan, manh tuan
hach toan » thanh toan, manh toan

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: doc ((hieu sach) OR (hieu cach)) - hanh trinh quan nhung phuong ((cach tuan) OR (hach toan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sach) or (hieu cach)) - hanh trinh quan nhung phuong ((cach tuan) OR (hach toan)) cao~".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sach) or (hieu cach)) - hanh trinh quan nhung phuong ((cach tuan) OR (hach toan)) cao*.