Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
tang van » dang van, hoang van, trong van
chat xuc » chat huu, cam xuc, chao xu
van hoi » van hoa, van hoc, van hoe
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
y tang » ky tang, 6 tang, 7 tang
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di 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) OR (doc sach)) y tang van hoi. hieu ve chat xuc va hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) y tang van hoi. hieu ve chat xuc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) y tang van hoi. hieu ve chat xuc va hanh vi cua tre*.