Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh nam » thanh nam, hanh lam, hanh ngay
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va chao » va cao, va chat, va cham
xu van » tu van, vu van, su van

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((nang x) or (lang xa)) hoi. hieu va chao xu van hanh nam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang x) OR (lang xa)) hoi. hieu va chao xu van hanh nam va triet.
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang x) or (lang xa)) hoi. hieu va chao xu van hanh nam va triet*.