Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
minh hoi » minh khoi, minh hoa, minh hai
tinh doi » trinh doc, trinh do, tinh hoc
sang tao » hang tai
hieu van » hieu va, thien van, lieu va
vuc van » duc van, luc van, thuc van
van cac » van hac, van cau, van bac
cac vuc » cac nuoc, cac vung, cac cuoc
tao hoc » thao hoc, cao hoc, bao hoc
ty sang » ty xang, ty hang, duy sang
cua cau » cua cac, cua chu, cua cay

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: ((te sach) OR (toc sach)) ty sang tao hoc. hieu van cac vuc van ((tinh doi) OR (minh hoi)) cua cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty sang tao hoc. hieu van cac vuc van ((tinh doi) or (minh hoi)) cua cau~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ty sang tao hoc. hieu van cac vuc van ((tinh doi) or (minh hoi)) cua cau*.