Perhaps you should try some spelling variations:
phuong doan » phuong loan, phuong hoang, huong dan
nhu phuong » thu phuong, nhung phuong, thi phuong
hien sach » kien sach, thien hach, chieu sach
dien sach » dien anh
tang luan » dung luan
doan toan » dan toan, doan tuan, doanh hoan
mang cua » manh cua, dung cua, ban cua
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien sach) OR (dien sach)) - hanh ((mang cua) or (tang luan)) nhu phuong doan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien sach) OR (dien sach)) - hanh ((mang cua) OR (tang luan)) nhu phuong doan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sach) OR (dien sach)) - hanh ((mang cua) or (tang luan)) nhu phuong doan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sach) OR (dien sach)) - hanh ((mang cua) or (tang luan)) nhu phuong doan toan cao*.