Perhaps you should try some spelling variations:
viec khoa » vien khoa, viec khong, lieu khoa
viec cho » viec nhom, viec cua, viec so
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
xuc cam » phuc cam
cam ban » can ban, cac ban, cam bay

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