Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
chau tren » cau tren, chay tren, cu tren
cac thuc » cach thuc, cac thu, can thuc
dao dinh » dao minh, dao tinh, dang dinh
sach ky » sac ky, sach y, sach ty
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
thuc ca » thuc cua, thuc can, thuc cao

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

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