Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
hoc sach » hoc sinh, hoc cac, hoc anh
va thanh » gia thanh, ban thanh, va tinh
dai hoi » dai hoc, dai hai, dai moi
truc va » thuc va, thuc vat, trung va
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, may nang
ma hoi » mai hoi, xa hoi, ma hoa
va cau » van cau, va cac, va dau
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((y nang) OR (v nang)) ((ma hoi) or (dai hoi)). hieu va cau truc va thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((y nang) OR (v nang)) ((ma hoi) OR (dai hoi)). hieu va cau truc va thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((y nang) OR (v nang)) ((ma hoi) or (dai hoi)). hieu va cau truc va thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((y nang) OR (v nang)) ((ma hoi) or (dai hoi)). hieu va cau truc va thanh dai cua tre*.