Perhaps you should try some spelling variations:
nhung huong » nhung phuong, nhung tuong, nhung cong
hien sach » dien sach, kien sach, thien hach
hanh manh » hanh mang, lanh manh, hoang manh
cua nhung » va nhung
manh cua » doanh cua, ban cua
toan tai » toan tap, doanh tai, toan ban
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 - hanh manh cua nhung huong dan ((toan tai) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sach - hanh manh cua nhung huong dan ((toan tai) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: hoc hien sach - hanh manh cua nhung huong dan ((toan tai) or (toan cao))*.