Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
tham thuc » nham thuc, pham thuc, tam thuc
thu sach » tu sach, thuat sach, thu hoach
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
cua tre » cua te, cua triet, dua tren
ve tham » va tham, ve cham, vi tham
hieu ve » hieu va, hieu van
nang co » nang cao, nang doc, nang noi
cuu tre » cau tren, cau treo
co hoi » co hoc, co loi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (thuoc sach)) ky nang co hoi. hieu ve tham thuc day hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) ky nang co hoi. hieu ve tham thuc day hanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) ky nang co hoi. hieu ve tham thuc day hanh vi ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) ky nang co hoi. hieu ve tham thuc day hanh vi ((cua tre) or (cuu tre))*.