Perhaps you should try some spelling variations:
ban hanh » ban hang
dua tren » dung tren
hanh hai » thanh hai, nhanh hai, hang hai
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
duc ban » duc tan, duc van, dua ban
su sac » su sach, su cac, su xac
ve cac » va cac, vien cac
sac ky » cac ky, sai ky
ve cam » ve cham, va cam, ve cai
cua te » cua tu

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 xa hoi. hieu ((ve cam) OR (ve cac)) duc ban hanh hai ((dua tren) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky tang xa hoi. hieu ((ve cam) OR (ve cac)) duc ban hanh hai ((dua tren) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: su sac ky tang xa hoi. hieu ((ve cam) OR (ve cac)) duc ban hanh hai ((dua tren) or (cua te))*.