Perhaps you should try some spelling variations:
ban hanh » ban hang
dau tren » dau tien, dat tren, dau tieng
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
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 dau » vi dai, va dau, bi dau

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 sang ma hoi. hieu ve cam xuc ((ban hanh) or (va danh)) vi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky sang ma hoi. hieu ve cam xuc ((ban hanh) OR (va danh)) vi dau tren.
• Adding a wildcard symbol may retrieve word variants: vu sach ky sang ma hoi. hieu ve cam xuc ((ban hanh) or (va danh)) vi dau tren*.