Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
xang lai » mang lai, dang loai, trang lai
dao dinh » do dinh, dao minh, dao tinh
dinh cau » dinh chau, dinh cuu, dinh cu
cau tren » cu tren, dau tren, ca tren
lai hoi » dai hoi, lai hoa, lai roi
qua cac » cua cac
cac thi » cac thoi, cau thi, can thi
y xang » ty xang
thi ca » thi cam, thi cua, thi cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (((toc sach) OR (thuoc sach)))) y xang lai hoi. hieu qua cac thi ca dao dinh cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (((toc sach) OR (thuoc sach)))) y xang lai hoi. hieu qua cac thi ca dao dinh cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (((toc sach) OR (thuoc sach)))) y xang lai hoi. hieu qua cac thi ca dao dinh cau tren".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (((toc sach) OR (thuoc sach)))) y xang lai hoi. hieu qua cac thi ca dao dinh cau tren*.