Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
danh tai » doanh tai, dinh tai, hanh tai
cam thuc » am thuc, cam thu, can thuc
cua tre » cua te, cua triet, dua tren
va danh » va dinh, va dan, va hanh
te sach » toc sach
cuu tre » cau tren, cau treo
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
o hoc » co hoc, mo hoc, so hoc

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang o hoc. hieu ve ((cam thuc) OR (nam thuc)) va danh tai ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang o hoc. hieu ve ((cam thuc) or (nam thuc)) va danh tai ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: te sach y nang o hoc. hieu ve ((cam thuc) or (nam thuc)) va danh tai ((cua tre) OR (cuu tre))*.