Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dieu cua » dieu tra
nang tai » hang tai, sang tai, nang cao
tang tai » hang tai, dung tai, sang tao
va cham » va chat, va tham
va dinh » van dinh, va kinh, va tinh
va danh » va dan, va hanh, dia danh
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2

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 v ((nang tai) or (tang tai)) hoi. hieu va cham soc ((va danh) or (va dinh)) dieu cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v ((nang tai) OR (tang tai)) hoi. hieu va cham soc ((va danh) OR (va dinh)) dieu cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach v ((nang tai) or (tang tai)) hoi. hieu va cham soc ((va danh) or (va dinh)) dieu cua tre*.