Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
hanh vai » hanh vi, hanh va, hanh van
cao tuc » dao tuc, cao duc, cao suc
tu nang » tru nang, tu nong, tu nano
qua cao » qua cac, qua ca, qua cai
cuu tre » cua tre, cau tren, cau treo
tuc va » thuc va, truc va, tuc xa
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((tu nang) or (truc nano)) x hoi. hieu qua cao tuc va ((hanh vai) or (hanh tai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((tu nang) OR (truc nano)) x hoi. hieu qua cao tuc va ((hanh vai) OR (hanh tai)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ((tu nang) or (truc nano)) x hoi. hieu qua cao tuc va ((hanh vai) or (hanh tai)) cuu tre*.