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