Perhaps you should try some spelling variations:
ban hang » ngan hang
cau tren » cu tren, dau tren, ca tren
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang ma hoi. hieu ve cam xuc ((ban hang) or (va danh)) vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ma hoi. hieu ve cam xuc ((ban hang) OR (va danh)) vi cau tren.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ma hoi. hieu ve cam xuc ((ban hang) or (va danh)) vi cau tren*.