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
nam thuc » nam thuoc, am thuc, nam thu
thuc may » thuc day, truc may, phuc may
hieu van » hieu va, thien van, lieu va
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

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