Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
dang xay » dang van, van xay
danh vai » danh sai, danh va, doanh van
tu sach » thu sach, su sach, te sach
sach lo » sach dao, sach doi, sach hoi
lo dang » lop dang, le dang, xo dang
xay hoi » xa hoi, tay hoi, cay phoi
cau duc » cao duc, cau luc, chu duc
va danh » va dinh, va dan, va hanh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet

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 lo dang xay hoi. ((hieu quan) OR (hieu qua)) cau duc va danh vai cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu sach lo dang xay hoi. ((hieu quan) or (hieu qua)) cau duc va danh vai cua tre*.