Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
tinh vien » sinh vien, tinh dien, tinh viet
va triet » va thiet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
va tinh » may tinh
nam luc » nang luc, nhan luc, nam thuc
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
san ky » sang ky, van ky, dan ky
luc va » duc va, tuc va, loc va
tu san » thu san, tu ban, tu can

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky ((nang ma) OR (sang ma)) hoi. hieu van nam luc va tinh vien ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((nang ma) OR (sang ma)) hoi. hieu van nam luc va tinh vien ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky ((nang ma) OR (sang ma)) hoi. hieu van nam luc va tinh vien ((cua triet) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: tu san ky ((nang ma) OR (sang ma)) hoi. hieu van nam luc va tinh vien ((cua triet) or (va triet))*.