Perhaps you should try some spelling variations:
sach bai » sach dao, cac bai, sach xa
bai nang » dai nang, bai tang, ban nang
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
cam duc » cam xuc, cao duc, nam duoc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet

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 bai nang x ho. hieu qua ((cam duc) OR (pham duc)) va hanh vi ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach bai nang x ho. hieu qua ((cam duc) OR (pham duc)) va hanh vi ((cua tre) OR (cau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach bai nang x ho. hieu qua ((cam duc) OR (pham duc)) va hanh vi ((cua tre) or (cau tren))*".