Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
danh vai » danh sai, danh va, doanh van
hieu van » hieu va, thien van, lieu va
va danh » va dinh, va dan, va hanh
cu tren » tu tren, dua tren
hieu ve » hieu va
mai hoi » mai khoi, dai hoi, lai hoi
ky dang » ky nang, ky danh
ky sang » ky nang, ky tang, duy sang
xuc va » duc va, tuc va, luc va
vai cu » vai cua, van 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: thu sach ((ky sang) OR (ky dang)) mai hoi. ((hieu ve) OR (hieu van)) cam xuc va danh vai cu tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky sang) or (ky dang)) mai hoi. ((hieu ve) OR (hieu van)) cam xuc va danh vai cu tren~".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky sang) or (ky dang)) mai hoi. ((hieu ve) OR (hieu van)) cam xuc va danh vai cu tren*.