Perhaps you should try some spelling variations:
thanh ve » hanh ve, thanh va, thanh vien
ve triet » va trien, su triet
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
truc va » thuc va, trung va
xang x » nang x
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho
ve ve » de ve, va ve, ke ve

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 ty xang x hoi. hieu ve cac ((truc va) OR (thuc vat)) thanh ve ve triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty xang x hoi. hieu ve cac ((truc va) OR (thuc vat)) thanh ve ve triet".
• Adding a wildcard symbol may retrieve word variants: so sach ty xang x hoi. hieu ve cac ((truc va) OR (thuc vat)) thanh ve ve triet*.