Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vat sinh » va sinh, van sinh, vi sinh
hieu van » hieu va, thien van, lieu va
vat dinh » va dinh, van dinh, vao dinh
te sach » toc sach
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
dang ha » dong ha, dung ha, lang ha
ky dang » ky nang, ky danh
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 dang ha noi. hieu van am thuc ((vat dinh) OR (vat sinh)) va ((cua triet) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang ha noi. hieu van am thuc ((vat dinh) OR (vat sinh)) va ((cua triet) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang ha noi. hieu van am thuc ((vat dinh) OR (vat sinh)) va ((cua triet) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang ha noi. hieu van am thuc ((vat dinh) OR (vat sinh)) va ((cua triet) or (cuu tre))*.