Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
nang ma » tang ma, sang ma, nang cao
van cau » van dau, van hau, van chat
cau tuc » cau truc, cau tu, cau luc
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y nang ma hoi. hieu van cau tuc va ((hanh tai) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang ma hoi. hieu van cau tuc va ((hanh tai) OR (hanh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang ma hoi. hieu van cau tuc va ((hanh tai) or (hanh vi)) cua tre*.