Perhaps you should try some spelling variations:
tinh vien » sinh vien, tinh dien, tinh hien
tinh viet » trinh viet, ninh viet, dinh viet
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
cao hoi » co hoi, cao hoc, tao hoi
nam luc » nang luc, nhan luc, nam thuc
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang ((cao hoi) or (cau hoi)). hieu van nam luc va ((tinh vien) OR (tinh viet)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((cao hoi) OR (cau hoi)). hieu van nam luc va ((tinh vien) OR (tinh viet)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ((cao hoi) or (cau hoi)). hieu van nam luc va ((tinh vien) OR (tinh viet)) cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((cao hoi) or (cau hoi)). hieu van nam luc va ((tinh vien) OR (tinh viet)) cua viet*.