Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
danh dat » danh bat, dinh dat, dan dat
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
tang ma » mang may, tang van
hieu ve » hieu van
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va danh » va dinh, va dan, va hanh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky ((nang cao) or (tang ma)) hoi. ((hieu ve) OR (hieu va)) cam duc va danh dat cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky ((nang cao) OR (tang ma)) hoi. ((hieu ve) OR (hieu va)) cam duc va danh dat cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky ((nang cao) or (tang ma)) hoi. ((hieu ve) OR (hieu va)) cam duc va danh dat cau tren".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky ((nang cao) or (tang ma)) hoi. ((hieu ve) OR (hieu va)) cam duc va danh dat cau tren*.