Perhaps you should try some spelling variations:
su sach » so sach, vu sach
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
vu nang » vuc nang, va nang, vu dang
tuc va » thuc va, truc va, tuc xa
v nang » va nang, van nang, voi nang
vi cua » vai cua, di cua
va cao » va co, va dao, va bao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((v nang) or (vu nang)) xa hoi. hieu ((va cao) or (va cac)) tuc va tinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((v nang) OR (vu nang)) xa hoi. hieu ((va cao) OR (va cac)) tuc va tinh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) or (vu nang)) xa hoi. hieu ((va cao) or (va cac)) tuc va tinh vi cua tre*.