Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
cac luc » cau luc, coc luc, cac nuoc
xang xa » mang xa, ang xa, dang xay
tinh du » tinh duc, tinh dau, tich du
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
sach tu » sach thu, cach tu, sach ty
va tinh » may tinh
hieu va » lieu va, hieu qua
du cua » duy cua, dau cua, dum cua
cua tu » cua tuc, cua su, cua cu
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 tu ((xang xa) or (lang xa)) hoi. ((hieu ve) OR (hieu va)) cac luc va tinh du cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tu ((xang xa) OR (lang xa)) hoi. ((hieu ve) OR (hieu va)) cac luc va tinh du cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tu ((xang xa) or (lang xa)) hoi. ((hieu ve) OR (hieu va)) cac luc va tinh du cua tu".
• Adding a wildcard symbol may retrieve word variants: so sach tu ((xang xa) or (lang xa)) hoi. ((hieu ve) OR (hieu va)) cac luc va tinh du cua tu*.