Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
may nang » may nong, ky nang, cam nang
than cua » nhan cua, thai cua, ban cua
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
ve cam » ve cham, ve cac, va cam
v nang » va nang, vu nang, van nang
cua tu » cua tuc, cua su, cua cu

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: toc sach ((may nang) OR (v nang)) cau hoi. hieu ve cam duc ((va danh) OR (va hanh)) than cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((may nang) or (v nang)) cau hoi. hieu ve cam duc ((va danh) OR (va hanh)) than cua tu~".
• Adding a wildcard symbol may retrieve word variants: toc sach ((may nang) or (v nang)) cau hoi. hieu ve cam duc ((va danh) OR (va hanh)) than cua tu*.