Perhaps you should try some spelling variations:
hanh than » hanh han, hanh nhan, hanh phan
hieu van » hieu va, thien van, lieu va
than cua » nhan cua, thai cua, ban cua
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
van bac » van ban, van bao, van hac
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc 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 ((nang xa) OR (lang xa)) hoi. hieu van bac xuc va hanh than cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) OR (lang xa)) hoi. hieu van bac xuc va hanh than cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) OR (lang xa)) hoi. hieu van bac xuc va hanh than cua tre*.