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

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