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
hanh lai » hanh lam, hanh tai, thanh lap
chau tre » chay tren, chau tho, cho tre
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va

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 ((xuc va) OR (luc va)) hanh 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 ((xuc va) OR (luc va)) hanh 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 ((xuc va) OR (luc va)) hanh lai chau tre".
• Adding a wildcard symbol may retrieve word variants: toc sach thuat nang xa hoi. ((hieu va) or (hieu qua)) cam ((xuc va) OR (luc va)) hanh lai chau tre*.