Perhaps you should try some spelling variations:
ban lanh » ban hanh, ban linh, ban anh
lanh hai » manh hai, thanh hai, lang chai
va triet » va thiet, va trien, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
xay hoi » tay hoi, cay phoi, gay thoi
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
ve cac » va cac, vien cac
hai va » hai van, thai va, hoi va

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 ky dang ((xay hoi) or (xa hoi)). hieu ve cac duc ban lanh hai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang ((xay hoi) OR (xa hoi)). hieu ve cac duc ban lanh hai va triet.
• Adding a wildcard symbol may retrieve word variants: su sach ky dang ((xay hoi) or (xa hoi)). hieu ve cac duc ban lanh hai va triet*.