Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
vua chua » sua chua, tua chua, cua chu
cua chua » sua chua, cua chu, cua nhua
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va tich » va tinh, va dich
va chua » ca chua, va chu, a chua

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 ky nang xa hoi. hieu va cham duc va tich ((va chua) or (((vua chua) OR (cua chua)))) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu va cham duc va tich ((va chua) OR (((vua chua) OR (cua chua)))) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu va cham duc va tich ((va chua) or (((vua chua) OR (cua chua)))) te".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu va cham duc va tich ((va chua) or (((vua chua) OR (cua chua)))) te*.