Perhaps you should try some spelling variations:
dinh duc » ninh duc, tinh duc, sinh duoc
sach ty » sach tu, sach thu, xach tay
cam luc » cam xuc, cau luc
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
luc va » duc va, tuc va, loc va
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: toc ((sach ty) or (sach y)) nang xa hoi. hieu va cam luc va ((dinh duc) OR (minh duc)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach y)) nang xa hoi. hieu va cam luc va ((dinh duc) OR (minh duc)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) or (sach y)) nang xa hoi. hieu va cam luc va ((dinh duc) OR (minh duc)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) or (sach y)) nang xa hoi. hieu va cam luc va ((dinh duc) OR (minh duc)) cuu tre*.