Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » thien van, lieu va, hieu ve
danh va » doanh va, hanh va, anh va
va danh » va dinh, va dan, va hanh
nam xuc » cam xuc, nam xua, nam thuc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
van hoi » van hoa, van hoc, van hoe
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
xuc va » duc va, tuc va, luc va
va cua » va chua, via cua, ca cua

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 lang) or (ky tang)) van hoi. ((hieu van) or (hieu va)) nam xuc va danh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky lang) OR (ky tang)) van hoi. ((hieu van) OR (hieu va)) nam xuc va danh va cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky lang) or (ky tang)) van hoi. ((hieu van) or (hieu va)) nam xuc va danh va cua tre*.