Perhaps you should try some spelling variations:
su sach » so sach, vu sach
dang xa » dang xay, lang xa, dang ha
hieu va » hieu qua
va tinh » may tinh
tinh va » tich va, trinh van, trinh vat
cua tre » cua te, cuu tre, cua triet
y dang » ky dang, 2 dang, _ dang
luc va » duc va, tuc va, loc va
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y dang xa hoi. ((hieu va) or (lieu va)) coc luc va tinh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y dang xa hoi. ((hieu va) OR (lieu va)) coc luc va tinh va cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach y dang xa hoi. ((hieu va) or (lieu va)) coc luc va tinh va cua tre*.