Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh hai » thanh hai, nhanh hai, hang hai
ban hanh » ban hang
cham duc » pham duc, cham soc, pham duy
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
duc ban » duc tan, duc van, dua ban
ky tang » ky nang, kho tang, ky trong
cuu tre » cua tre, cau treo
su sac » su sach, su cac, su xac

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

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