Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cau treo » cau theo, cau tren, cau triet
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
va hanh » va thanh, va danh, ban hanh
dai cau » dat cau, da cau, dai hau
xang o » lang o, tang o, dang o
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 ty xang o hoi. hieu va cac xuc ((va hanh) or (van hanh)) dai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty xang o hoi. hieu va cac xuc ((va hanh) OR (van hanh)) dai cau treo*.