Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
dau tren » dau tien, dat tren, dau tieng
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang xa hoi. hieu va cham soc ((va danh) or (ban thanh)) dinh ((dau tren) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu va cham soc ((va danh) OR (ban thanh)) dinh ((dau tren) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu va cham soc ((va danh) or (ban thanh)) dinh ((dau tren) or (cua tre))*.