Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
doan vi » doan va, don vi, doan thi
luc cao » luc cho, luc canh, quoc cao
cua tre » cua te, cuu tre, cua triet
xang xa » lang xa, mang xa, ang xa
va ngay » va nay, tan ngay
luc ca » luc cua, luc va, luc ha
dan vi » don vi, dan va, gan vi

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 ngay ((luc ca) or (luc cao)) ((dan vi) OR (doan vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty xang xa hoi. lieu va ngay ((luc ca) OR (luc cao)) ((dan vi) OR (doan vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty xang xa hoi. lieu va ngay ((luc ca) or (luc cao)) ((dan vi) OR (doan vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ty xang xa hoi. lieu va ngay ((luc ca) or (luc cao)) ((dan vi) OR (doan vi)) cua tre*.