Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
lanh hai » manh hai, thanh hai, lang chai
hai cua » thai cua, dai cua, hoi cua
duc ban » duc van, dua ban, duc man
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
xay hoi » tay hoi, cay phoi, gay thoi
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac

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) or (duc tan)) lanh hai cua 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) OR (duc tan)) lanh hai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang ((xay hoi) OR (xa hoi)). hieu ve cac ((duc ban) or (duc tan)) lanh hai cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang ((xay hoi) OR (xa hoi)). hieu ve cac ((duc ban) or (duc tan)) lanh hai cua triet*.