Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, lieu vien
toc sach » doc sach, thuoc sach, nuoc sach
van hanh » van thanh, ban hanh, van ban
vien cac » vien bach, vien dai, vien da
hoc sach » hoc sinh, hoc cac, hoc anh
tu nang » tru nang, tu nong, tu nano
nang co » nang cao, nang doc, nang noi
cac vuc » cac nuoc, cac vung, cac cuoc
van anh » van thanh, tuan anh, van minh
cua cau » cua cac, cua chu, cua cay
vi cua » vai cua, di cua

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: ((toc sach) OR (hoc sach)) tu nang co hoc. hieu vien cac vuc ((van hanh) OR (van anh)) vi cua cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) tu nang co hoc. hieu vien cac vuc ((van hanh) or (van anh)) vi cua cau~".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) tu nang co hoc. hieu vien cac vuc ((van hanh) or (van anh)) vi cua cau*.