Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
theo chieu » ho chieu, theo chu, thi chieu
quan nhung » qua nhung, cua nhung, luan chung
phuong tap » phuong tay, phuong tai, phuong phap
dung quan » dung quang, dung luan, luong quan
tap toan » tap doan, tap quan, bai toan
toan cau » toan cao, toan ban, toan tap
ha dung » hai dung, kha dung, nha dung

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (theo tieu)) sach - ha dung quan nhung phuong tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (theo tieu)) sach - ha dung quan nhung phuong tap toan cau.
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (theo tieu)) sach - ha dung quan nhung phuong tap toan cau*.