Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
vua chua » sua chua, cua chua, tua chua
tu sach » thu sach, su sach, te 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 » va chu, a chua, ta chua
ca chua » ca cua, sua chua

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

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