Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien dai » hien dai
dai nuoc » dat nuoc, dau nuoc, dai luoc
van hanh » van thanh, ban hanh, van anh
cau treo » cau theo, cau tren, cau triet
te sach » toc sach
va hanh » va thanh, va danh, ban hanh
di cau » da cau, diem cau
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thu hoach)) ky nang x hoi. hieu vien dai nuoc ((va hanh) or (van hanh)) di cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu hoach)) ky nang x hoi. hieu vien dai nuoc ((va hanh) OR (van hanh)) di cau treo.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu hoach)) ky nang x hoi. hieu vien dai nuoc ((va hanh) or (van hanh)) di cau treo*.