Perhaps you should try some spelling variations:
tinh viec » tinh viet, dinh viec, sinh viec
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
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, loc va
tuc va » thuc va, truc va, tuc xa

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) or (tuc va)) tinh viec cua triet~.
• 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) OR (tuc va)) tinh viec cua triet.
• 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) or (tuc va)) tinh viec cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((ma hoi) OR (xa hoi)). hieu van nam ((luc va) or (tuc va)) tinh viec cua triet*.