Perhaps you should try some spelling variations:
cuoc luc » coc luc, duoc lac, duoc luu
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren, cau treo
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
so sach » so sanh, bo sach, co sach
hieu va » hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
su hien » su kien, su tien, thu hien
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: so sach ky lang xa hoi. ((hieu va) OR (lieu va)) cuoc luc va tinh vi ((cuu tre) or (su hien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky lang xa hoi. ((hieu va) OR (lieu va)) cuoc luc va tinh vi ((cuu tre) OR (su hien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky lang xa hoi. ((hieu va) OR (lieu va)) cuoc luc va tinh vi ((cuu tre) or (su hien))".
• Adding a wildcard symbol may retrieve word variants: so sach ky lang xa hoi. ((hieu va) OR (lieu va)) cuoc luc va tinh vi ((cuu tre) or (su hien))*.