Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
mai khoi » mai khoa, tai khoa, cac khoi
danh bat » doanh bat, anh bai, dinh ba
danh sai » dung sai, danh dau, hanh san
cau tren » cu tren, dau tren, ca tren
mai hoi » dai hoi, lai hoi, mai doi
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va

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