Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
qua cham » qua hai, qua cac, va cham
van lien » van tien, van hien, va lien
lien cuc » dien cuc, lien tuc, vien cac
sach ky » sac ky, sach y, sach ty
cuc tre » duc tre, cua tre, cuu tre
nang o » nang co, nang ho, nang ro
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
o hoi » co hoi, o hoc, o hai

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 ky nang o hoi. hieu qua cham ((xuc va) or (luc va)) van lien cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang o hoi. hieu qua cham ((xuc va) OR (luc va)) van lien cuc tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang o hoi. hieu qua cham ((xuc va) or (luc va)) van lien cuc tre*.