Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
cua tre » cua te, cuu tre, dua tren
va nay » va ngay
va cay » va cac, va cao, va cai
luc va » duc va, tuc va, loc va
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan 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 ty xang xa hoi. lieu ((va nay) or (va cay)) luc va dan vi ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty xang xa hoi. lieu ((va nay) OR (va cay)) luc va dan vi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty xang xa hoi. lieu ((va nay) or (va cay)) luc va dan vi ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: so sach ty xang xa hoi. lieu ((va nay) or (va cay)) luc va dan vi ((cua tre) OR (cua triet))*.