Perhaps you should try some spelling variations:
su triet » su viet, su tien
cac truc » cau truc, cac tru, cac trung
ve triet » va trien
thanh gi » thanh nghi, thanh gian, thanh hai
va thanh » gia thanh, ban thanh, va tinh
truc va » thuc va, thuc vat, trung va
so sach » so sanh, bo sach, co sach
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac

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 tu ((xang x) or (nang x)) hoi. hieu ve cac truc va thanh gi ((ve triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tu ((xang x) OR (nang x)) hoi. hieu ve cac truc va thanh gi ((ve triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tu ((xang x) or (nang x)) hoi. hieu ve cac truc va thanh gi ((ve triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: so sach tu ((xang x) or (nang x)) hoi. hieu ve cac truc va thanh gi ((ve triet) OR (su triet))*.