Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hien sach » dien sach, kien sach, thien hach
sach duoc » sach nuoc, sach dao, sach dung
thu sach » tu sach, thuat sach, thuoc sach
tay lang » tai lang, tay tang, tay quang
su triet » su viet, su tien, ve triet
ky lang » ky dang, ky tang
duoc va » nuoc va, duc va, duoc ma
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((((ky lang) OR (tay lang))) or (ky nang)) xa hoi. hieu hien sach duoc va hanh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((((ky lang) OR (tay lang))) OR (ky nang)) xa hoi. hieu hien sach duoc va hanh va su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((((ky lang) OR (tay lang))) or (ky nang)) xa hoi. hieu hien sach duoc va hanh va su triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ((((ky lang) OR (tay lang))) or (ky nang)) xa hoi. hieu hien sach duoc va hanh va su triet*.