Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
cam tuc » cam tu, dam thuc, nam truc
hieu va » lieu va, hieu qua
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, xa hoi, ma hoa
tai va » thai va, mai va, tri va
thiet » thieu

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 ky sang ma hoi. hieu va ((((cam tuc) OR (nam thuc))) OR (cam xuc)) va hanh tai va thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky sang ma hoi. hieu va ((((cam tuc) OR (nam thuc))) or (cam xuc)) va hanh tai va thiet~".
• Adding a wildcard symbol may retrieve word variants: su sach ky sang ma hoi. hieu va ((((cam tuc) OR (nam thuc))) or (cam xuc)) va hanh tai va thiet*.