Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dung sai » dung tai, dung va, dung dat
danh sai » danh bat, danh dau, hanh san
mai khoi » mai khoa, tai khoa, cac khoi
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
mai hoi » dai hoi, lai hoi, mai doi
ky sang » ky nang, ky dang, ky tang
ca tren » cau tren, cu tren, la tren
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 (dung sai)) ca 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 (dung sai)) ca 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 (dung sai)) ca tren*".