Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va khac » va khao, va kha, vu khac
dinh vi » dinh ve, dinh viet, dinh tri
danh di » danh du, xanh di, danh dien
cuu tre » cua tre, cau tren, cau treo
va hac » van hac, va cac, va hoc
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. hieu ((va hac) OR (va khac)) tuc va ((dinh vi) or (danh di)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. hieu ((va hac) OR (va khac)) tuc va ((dinh vi) OR (danh di)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x hoi. hieu ((va hac) OR (va khac)) tuc va ((dinh vi) or (danh di)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu ((va hac) OR (va khac)) tuc va ((dinh vi) or (danh di)) cuu tre*.