Perhaps you should try some spelling variations:
nhung phong » nhung phuong, nhung chong, nung phong
tranh quan » tranh quang, trinh quan, tranh luan
chieu sach » chinh sach, chiet tach, chieu sang
quan nhung » qua nhung, cua nhung, luan chung
hieu sach » hieu cach, dien sach, hieu cac
manh toan » thanh toan, anh tuan, tinh toan
anh toan » anh tuan, thanh toan, nganh 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 (chieu sach)) - canh tranh quan nhung phong ((anh toan) OR (manh toan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sach) or (chieu sach)) - canh tranh quan nhung phong ((anh toan) OR (manh toan)) cao~".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sach) or (chieu sach)) - canh tranh quan nhung phong ((anh toan) OR (manh toan)) cao*.