Perhaps you should try some spelling variations:
sinh viec » sinh vien, dinh viec, ninh viet
tinh viec » tinh viet, dinh viec, tich viec
hieu van » hieu va, thien van, lieu va
nam luc » nang luc, nhan luc, nam thuc
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » mai hoi, ma hoa, me hoi
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 ((ma hoi) or (xa hoi)). hieu van nam luc va ((tinh viec) OR (sinh viec)) hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((ma hoi) OR (xa hoi)). hieu van nam luc va ((tinh viec) OR (sinh viec)) hoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ((ma hoi) or (xa hoi)). hieu van nam luc va ((tinh viec) OR (sinh viec)) hoa viet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((ma hoi) or (xa hoi)). hieu van nam luc va ((tinh viec) OR (sinh viec)) hoa viet*.