Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van dinh » van minh, van dich, xuan dinh
dien cuc » dien tu, dieu cua, vien cac
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va dinh » va kinh, va tinh, vu dinh
v nang » va nang, vu nang, van nang
thue » thu, thuc, thuy

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) v nang xa hoi. hieu va cham soc ((va dinh) or (van dinh)) dien cuc thue~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) v nang xa hoi. hieu va cham soc ((va dinh) OR (van dinh)) dien cuc thue.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) v nang xa hoi. hieu va cham soc ((va dinh) or (van dinh)) dien cuc thue*.