Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
luoc van » luoc can, luoc va, luc van
nam luoc » nam duoc, nam buoc, nam quoc
chat hoa » thuat hoa, chat va, chat huu
hieu va » lieu va, hieu qua
cao hoi » cau hoi, co hoi, cao hoc
van anh » van thanh, tuan anh, van minh
va chua » vua chua, ca chua, va chu
y nang » ky nang, ly nang, v nang
va cua » via cua, ca cua, ma cua
va nam » van nam, ha nam, va nay

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 y nang ((cao hoi) or (chat hoa)). hieu va nam luoc van anh ((va cua) OR (va chua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ((cao hoi) OR (chat hoa)). hieu va nam luoc van anh ((va cua) OR (va chua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ((cao hoi) or (chat hoa)). hieu va nam luoc van anh ((va cua) OR (va chua)) tre*".