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