Perhaps you should try some spelling variations:
hang doi » hang di, hang loi, huong doi
ban hang » ngan hang
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
xuc ban » duc ban, cuc ban, quoc ban
doi cua » dai cua, hoi cua
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ve cac » va cac, vien cac
ve cai » va cai, ve tai, ve cau
va cam » va cham, va cac, va cao
ma hoi » mai hoi, xa hoi, ma hoa

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 sach ty nang ma hoi. hieu ((((ve cac) OR (ve cai))) OR (va cam)) xuc ban hang doi cua vat~.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ma hoi. hieu ((((ve cac) or (ve cai))) or (va cam)) xuc ban hang doi cua vat*.