Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
thanh ca » thanh cha, thanh cac, thanh ha
su sach » so sach, vu sach
van cam » van lam, van cau, van dam
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
tuc va » thuc va, truc va, tuc xa
ca cua » co cua

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 ((y nang) or (v nang)) xa hoi. hieu ((van cam) OR (van nam)) tuc va thanh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) xa hoi. hieu ((van cam) OR (van nam)) tuc va thanh ca cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) or (v nang)) xa hoi. hieu ((van cam) OR (van nam)) tuc va thanh ca cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (v nang)) xa hoi. hieu ((van cam) OR (van nam)) tuc va thanh ca cua tre*.