Perhaps you should try some spelling variations:
thanh vi » thanh va, thanh ve, nhanh vi
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach tu, sach thu
su viet » so viet
truc va » thuc vat, trung va
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
xang x » nang x
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty xang x hoi. hieu ve cac ((truc va) OR (thuc va)) ((thanh vi) or (hanh vi)) su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty xang x hoi. hieu ve cac ((truc va) OR (thuc va)) ((thanh vi) OR (hanh vi)) su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty xang x hoi. hieu ve cac ((truc va) OR (thuc va)) ((thanh vi) or (hanh vi)) su viet".
• Adding a wildcard symbol may retrieve word variants: su sach ty xang x hoi. hieu ve cac ((truc va) OR (thuc va)) ((thanh vi) or (hanh vi)) su viet*.