Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
chet duoc » che duoc, cho duoc, che quoc
thu sach » tu sach, thuoc sach, thu hoach
cao chet » cao chat, cai chet, chai chet
hieu cao » chieu cao, hieu cac, hieu ca
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
duoc va » nuoc va, duc va, duoc ma
va danh » va dinh, va dan, va hanh
ma hoi » mai hoi, xa hoi, ma hoa
do cua » doi cua, co cua, dong cua
de cua » le cua, te cua, dieu 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) OR (thuat sach)) ky sang ma hoi. hieu cao chet duoc va danh ((do cua) or (de cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) ky sang ma hoi. hieu cao chet duoc va danh ((do cua) OR (de cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuat sach)) ky sang ma hoi. hieu cao chet duoc va danh ((do cua) or (de cua)) tre*".