Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh ve » hanh ve, thanh va, thanh vien
su sach » so sach, vu sach
dang xa » dang xay, lang xa, dang ha
van cam » van nam, van lam, van cau
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu
tuc va » thuc va, truc va, tuc xa
xac va » tac va, ac va, bac va

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 _ dang xa hoi. hieu van cam ((xac va) or (tuc va)) thanh ve ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach _ dang xa hoi. hieu van cam ((xac va) OR (tuc va)) thanh ve ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach _ dang xa hoi. hieu van cam ((xac va) or (tuc va)) thanh ve ((cua tre) OR (cua te))*".