Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
hang tai » hang va, dung tai
hanh hai » thanh hai, nhanh hai, hang hai
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
va cham » va chat, va tham
hieu va » lieu va, hieu qua
ky danh » ky anh
ky dang » ky nang
su sac » su sach, su cac, su xac

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

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