Perhaps you should try some spelling variations:
viec khoa » vien khoa, viec khong, lieu khoa
viec cho » viec nhom, viec cua, viec so
phuc nam » phuc cam, phuc cham, hoc nam
dau treo » dau tren, cau treo, dau theo
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
dan va » doan va, ban va, han va
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: su sach ky nang x hoi. hieu ((viec cho) or (viec khoa)) phuc nam ((dan va) OR (dan ca)) dau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu ((viec cho) OR (viec khoa)) phuc nam ((dan va) OR (dan ca)) dau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu ((viec cho) or (viec khoa)) phuc nam ((dan va) OR (dan ca)) dau treo".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu ((viec cho) or (viec khoa)) phuc nam ((dan va) OR (dan ca)) dau treo*.