Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh viec » tinh viet, dinh viec, sinh viec
hieu van » hieu va, thien van, lieu va
va tinh » may tinh
nam luc » nang luc, nhan luc, nam thuc
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
tu sach » thu sach, su sach, te sach
luc va » duc va, tuc va, loc va
tu sac » tu cac, tu san, tu bac

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