Perhaps you should try some spelling variations:
sach thuat » sach tham, dich thuat, cac thuat
thuat nang » thuat bang, thuat mang, thuat trang
toc sach » hoc sach, doc sach, thuoc sach
chau tre » chay tren, chau tho, cho tre
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach thuat nang xa hoi. ((hieu va) or (hieu qua)) cam duc ((va hanh) OR (va danh)) lai chau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thuat nang xa hoi. ((hieu va) OR (hieu qua)) cam duc ((va hanh) OR (va danh)) lai chau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach thuat nang xa hoi. ((hieu va) or (hieu qua)) cam duc ((va hanh) OR (va danh)) lai chau tre".
• Adding a wildcard symbol may retrieve word variants: toc sach thuat nang xa hoi. ((hieu va) or (hieu qua)) cam duc ((va hanh) OR (va danh)) lai chau tre*.