Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
danh vi » hanh vi, dinh vi, danh di
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va cao » va co, va dao, va bao
tuc va » thuc va, truc va, duc va
vi cua » vai cua, di cua
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: tu sach y nang x hoi. hieu ((va cao) or (va cac)) ((tuc va) or (tuc xa)) danh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu ((va cao) OR (va cac)) ((tuc va) OR (tuc xa)) danh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu ((va cao) or (va cac)) ((tuc va) or (tuc xa)) danh vi cua tre*.