Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
van hoc » van hoa
hoc tuc » hoc thuc, hoc truc, hoc tu
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
tuc va » thuc va, truc va, tuc xa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang x) OR (lang xa)) hoi. hieu van hoc tuc va hanh vi ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang x) or (lang xa)) hoi. hieu van hoc tuc va hanh vi ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang x) or (lang xa)) hoi. hieu van hoc tuc va hanh vi ((cua tre) OR (cuu tre))*.