Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cam luc » cam xuc, cau luc
mai hoi » mai khoi, dai hoi, lai hoi
cu tren » tu tren, dua tren
va cam » va cham, va cac, va cao
y nang » ky nang, ly nang, v nang
ma hoi » xa hoi, ma hoa, me hoi
vi cu » vi su, vi xu, vi du

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