Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh vien » sinh vien, tinh dien, tinh viet
vien cua » viec cua, dien cua, tien cua
nam thuc » nam thuoc, am thuc, nam thu
hieu va » hieu qua
va tinh » may tinh
nang co » nang cao, nang doc, nang noi
thuc va » thuc vat, thuc dan, thuc day
san ky » sang ky, van ky, ban ky
co hoi » co hoc, co loi
dan ky » van 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 ((san ky) OR (dan ky)) nang co hoi. ((lieu va) or (hieu va)) nam thuc va tinh vien cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (dan ky)) nang co hoi. ((lieu va) OR (hieu va)) nam thuc va tinh vien cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((san ky) OR (dan ky)) nang co hoi. ((lieu va) or (hieu va)) nam thuc va tinh vien cua triet".
• Adding a wildcard symbol may retrieve word variants: tu ((san ky) OR (dan ky)) nang co hoi. ((lieu va) or (hieu va)) nam thuc va tinh vien cua triet*.