Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
vat dinh » va dinh, van dinh, vat sinh
sach ky » sac ky, sach ty, sach kem
dung ha » dung va, dung he, dung khoa
dinh va » dinh van, dinh ve, tinh va
cuu tre » cua tre, cau tren, cau treo
van am » van nam, van lam, van dam
thuc » thu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) OR (sach y)) dung ha noi. hieu van am thuc vat dinh va ((cua triet) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) dung ha noi. hieu van am thuc vat dinh va ((cua triet) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach y)) dung ha noi. hieu van am thuc vat dinh va ((cua triet) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sach y)) dung ha noi. hieu van am thuc vat dinh va ((cua triet) or (cuu tre))*.