Perhaps you should try some spelling variations:
nang duoc » ngang duoc, nang doc, nganh duoc
duoc hoi » quoc hoi, duoc hoc, duoc si
toc sach » hoc sach, doc sach, thuoc sach
va hanh » van hanh, va thanh, va danh
cam duc » cam xuc, cao duc, pham duc
cuu tre » cua tre, cau tren, cau treo
tu nang » tru nang, tu nong, tu nano
va dan » ca dan, va dao, va dau
va cuu » va cau, va chu, va huu
va cam » va cham, va cac, va cao

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)) tu nang duoc hoi. lieu va cam duc ((va hanh) or (va dan)) va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) tu nang duoc hoi. lieu va cam duc ((va hanh) OR (va dan)) va cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) tu nang duoc hoi. lieu va cam duc ((va hanh) or (va dan)) va cuu tre*".