Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nang tai » hang tai, tang tai, sang tai
dua tren » dung tren
nang mai » nang ma, lang mai, nang cai
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
vi dua » vi du, vi dum, vi lua
va cam » va cham, va cac, va cao

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 ((nang mai) or (nang tai)) hoi. lieu va cam xuc ((va hanh) OR (va danh)) vi dua tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang mai) OR (nang tai)) hoi. lieu va cam xuc ((va hanh) OR (va danh)) vi dua tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang mai) or (nang tai)) hoi. lieu va cam xuc ((va hanh) OR (va danh)) vi dua tren".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang mai) or (nang tai)) hoi. lieu va cam xuc ((va hanh) OR (va danh)) vi dua tren*.