Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
chat quoc » chuan quoc, thuat quoc, han quoc
su sach » vu sach
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
dai cuu » dai cua, dai huu
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
gia » giao

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) OR (so sach)) y nang xa hoi. hieu ve chat quoc gia thanh dai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) y nang xa hoi. hieu ve chat quoc gia thanh dai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) y nang xa hoi. hieu ve chat quoc gia thanh dai cuu tre*.