Perhaps you should try some spelling variations:
viec khoa » vien khoa, viec khong, lieu khoa
cau triet » cau trieu, su triet, cua triet
viec cho » viec nhom, viec cua, viec so
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cam dan » ca dan, nam dan, cay dan
cac cau » cac mau, bac cau, ca cau

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 xa hoi. hieu ((viec cho) or (viec khoa)) xuc ((cam dan) OR (cac dan)) cac cau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu ((viec cho) OR (viec khoa)) xuc ((cam dan) OR (cac dan)) cac cau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu ((viec cho) or (viec khoa)) xuc ((cam dan) OR (cac dan)) cac cau triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu ((viec cho) or (viec khoa)) xuc ((cam dan) OR (cac dan)) cac cau triet*.