Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
cac truc » cau truc, cac tru, cac trung
truc van » truc va, thuc van, truc ban
van hang » van khang, van hoang, van thang
hang don » hang ton, hang doi, dang don
su sach » so sach, vu sach
vu nang » vuc nang, va nang, vu dang
su tien » su kien, su hien, tu tieng
v nang » va nang, van nang, voi nang
don su » dong su, down su, dan su

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((v nang) or (vu nang)) xa hoi. hieu vien cac truc van hang don su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((v nang) OR (vu nang)) xa hoi. hieu vien cac truc van hang don su tien.
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) or (vu nang)) xa hoi. hieu vien cac truc van hang don su tien*.