Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
vuc nang » vu nang, chuc nang, van nang
cuc nang » chuc nang, cuu nang, cua nang
cuu tre » cua tre, cau tren, cau treo
va cam » va cham, va cao, va cai
luc va » duc va, tuc va, loc va
va dan » ca dan, va dao, va dau
dan di » danh di, dan da, dan de
di cuu » di cau, di cua, dinh cuu
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 ((vuc nang) or (cuc nang)) o hoi. hieu ((va cam) or (va cac)) luc va dan di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((vuc nang) OR (cuc nang)) o hoi. hieu ((va cam) OR (va cac)) luc va dan di cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ((vuc nang) or (cuc nang)) o hoi. hieu ((va cam) or (va cac)) luc va dan di cuu tre*.