Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thanh di » thanh doi, thanh de, thanh do
hieu van » hieu va, thien van, lieu va
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
co sach » bo sach, cuon sach, hoc sach
van cam » van nam, van lam, van cau
long ha » dong ha, cong ha, dong hoa
xac va » tac va, ac va, bac va
y long » sy long, _ long, o long
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach y long ha hoi. hieu van cam ((xac va) or (thuc va)) thanh di ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach y long ha hoi. hieu van cam ((xac va) OR (thuc va)) thanh di ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: co sach y long ha hoi. hieu van cam ((xac va) or (thuc va)) thanh di ((cua tre) or (su triet))*.