Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
cac luc » cau luc, coc luc, cac nuoc
hieu va » lieu va, hieu qua
hieu ve » hieu van
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang
luc va » duc va, tuc va, loc va
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty hang xa hoi. ((hieu ve) OR (hieu va)) cac luc va tinh vi ((cua te) OR (qua su))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty hang xa hoi. ((hieu ve) OR (hieu va)) cac luc va tinh vi ((cua te) or (qua su))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty hang xa hoi. ((hieu ve) OR (hieu va)) cac luc va tinh vi ((cua te) or (qua su))*.