Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nang mai » nang ma, nang tai, lang mai
mai hoi » mai khoi, dai hoi, lai hoi
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
vi cua » di cua

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 y nang mai hoi. hieu ((va cac) or (va bai)) xuc va hanh ((vi cua) OR (vai cua)) vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang mai hoi. hieu ((va cac) OR (va bai)) xuc va hanh ((vi cua) OR (vai cua)) vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang mai hoi. hieu ((va cac) or (va bai)) xuc va hanh ((vi cua) OR (vai cua)) vat".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang mai hoi. hieu ((va cac) or (va bai)) xuc va hanh ((vi cua) OR (vai cua)) vat*.