Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
dang hai » dang khai, hang hai, dung hai
danh hai » lanh hai, manh hai, danh hau
duc ban » duc tan, duc van, dua ban
va cham » va chat, va tham
sach ky » sach y, sach ty, sach kem
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky

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) or (sac ky)) lang xa hoi. hieu va cham duc ban ((danh hai) OR (dang hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) lang xa hoi. hieu va cham duc ban ((danh hai) OR (dang hai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) lang xa hoi. hieu va cham duc ban ((danh hai) OR (dang hai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) lang xa hoi. hieu va cham duc ban ((danh hai) OR (dang hai)) cua tre*.