Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
tao nano » tao nganh, cao nang, tao nhan
van hanh » ban hanh, van anh, van ban
su sach » so sach, vu sach
tai cua » thai cua, tai cuc, tri cua
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
bac hoc » bai hoc, bac ho
tao cao » bao cao, toan cao
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: su sach ((tao nano) OR (tao cao)) bac hoc. hieu va cac xuc ((van hanh) OR (van thanh)) tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((tao nano) or (tao cao)) bac hoc. hieu va cac xuc ((van hanh) OR (van thanh)) tai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ((tao nano) or (tao cao)) bac hoc. hieu va cac xuc ((van hanh) OR (van thanh)) tai cua tre*.