Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tang mai » tang ma, tang tai, lang mai
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
va hanh » va thanh, va danh, ban hanh
su viet » so viet
va cam » va cham, va cac, va cao
tai su » tai so, tai tu, lai su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky tang mai hoi. hieu va cam xuc ((va hanh) or (van hanh)) tai su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky tang mai hoi. hieu va cam xuc ((va hanh) OR (van hanh)) tai su viet.
• Adding a wildcard symbol may retrieve word variants: thu sach ky tang mai hoi. hieu va cam xuc ((va hanh) or (van hanh)) tai su viet*.