Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
ky dang » ky nang, ky danh
van cac » van hac, van cau, van bac
cac tuc » cac toc, cac tu, cac tac
va dinh » van dinh, va kinh, va tinh
cua tre » cuu tre, cua triet, dua tren
y dang » 2 dang, _ dang, b dang
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

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: hoc sach ((y dang) OR (ky dang)) xa hoi. hieu van cac tuc va dinh van ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((y dang) OR (ky dang)) xa hoi. hieu van cac tuc va dinh van ((cua tre) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((y dang) OR (ky dang)) xa hoi. hieu van cac tuc va dinh van ((cua tre) or (cua te))*.