Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
sach phu » sach phat, sach thue, sach phap
sach thu » sach thue, sach thieu, sach tham
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
cua tre » cua te, cua triet, dua tren
hanh va » hang va, hanh vi
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
cuu tre » cau tren, cau treo

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 phu) OR (sach thu)) lang xa hoi. hieu va cac thuc day hanh va ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach phu) OR (sach thu)) lang xa hoi. hieu va cac thuc day hanh va ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach phu) OR (sach thu)) lang xa hoi. hieu va cac thuc day hanh va ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te ((sach phu) OR (sach thu)) lang xa hoi. hieu va cac thuc day hanh va ((cua tre) or (cuu tre))*.