Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh viec » tinh viet, dinh viec, sinh viec
nang mai » nang ma, nang tai, lang mai
hieu van » hieu va, thien van, lieu va
mai hoi » mai khoi, dai hoi, lai hoi
nam luc » nhan luc, nam thuc, nam duoc
va tinh » may tinh
sac ky » sai ky

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