Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dat tren » dat trong, dua tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang co » nang cao, nang doc, nang noi
van cac » van hac, van cau, van bac
cac luc » cau luc, coc luc, cac nuoc
hanh ve » hanh va, hanh kem
co loi » co hoi
luc va » duc va, tuc va, loc va

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 ky nang co loi. hieu van cac luc va ((hanh ve) OR (hanh vi)) dat tren~.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang co loi. hieu van cac luc va ((hanh ve) or (hanh vi)) dat tren*.