Perhaps you should try some spelling variations:
hieu hoc » lieu hoc, hieu hoa, tieu hoc
danh vai » danh sai, danh va, doanh van
tieu hoa » tien hoa, dien hoa, lieu hoc
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
su sach » so sach, vu sach
vu nang » vuc nang, va nang, vu dang
cua tre » cua te, cuu tre, cua triet
v nang » va nang, van nang, voi nang

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: su sach ((v nang) OR (vu nang)) xa hoi. hien ((hieu hoc) OR (tieu hoa)) nuoc va danh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((v nang) OR (vu nang)) xa hoi. hien ((hieu hoc) or (tieu hoa)) nuoc va danh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) OR (vu nang)) xa hoi. hien ((hieu hoc) or (tieu hoa)) nuoc va danh vai cua tre*.