Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
cua triet » cua viet, su triet, va triet
vien cac » vien bach, vien dai, vien da
cac thuc » cach thuc, cac thu, can thuc
thuc van » thuc vat, thuc dan, thuc va
so sach » so sanh, bo sach, co sach
hang di » hang doi, hang dien, hang dich
hang vi » hang va, hanh vi, khang voi
y nang » ly nang, v nang, may nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((y nang) OR (ky nang)) xa hoi. hieu vien cac thuc van ((hang di) or (hang vi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((y nang) OR (ky nang)) xa hoi. hieu vien cac thuc van ((hang di) OR (hang vi)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((y nang) OR (ky nang)) xa hoi. hieu vien cac thuc van ((hang di) or (hang vi)) cua triet*".