Perhaps you should try some spelling variations:
sach tham » sach nha
thanh vai » thanh hai, thanh van, thanh tai
hoc sach » hoc sinh, hoc cac, hoc anh
va thanh » gia thanh, ban thanh, va tinh
cam truc » cau truc, nam truc, lam truoc
vai cua » dai cua, hai cua, lai cua
truc va » thuc va, thuc vat, trung va
hieu va » hieu qua
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cua tre » cua te, cuu tre, cua triet

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