Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
truc va » thuc va, thuc vat, trung va
danh di » danh du, xanh di, danh dien
danh vi » hanh vi, dinh vi, danh va
cuu tre » cua tre, cau tren, cau treo
van hac » van hoc, van ha, van hai
y nang » ky nang, ly nang, v nang
tuc va » thuc va, tuc xa, duc va
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 van hac ((tuc va) or (truc va)) ((danh 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 van hac ((tuc va) OR (truc va)) ((danh vi) OR (danh di)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu van hac ((tuc va) or (truc va)) ((danh vi) or (danh di)) cuu tre*.