Perhaps you should try some spelling variations:
thien van » thi van
cau thuc » cau truc, cuu thuc, can thuc
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
te sach » toc sach
cua tre » cua te, cua triet, dua tren
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cuu tre » cau tren, cau treo
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: te sach ky nang x hoi. ((hieu ve) or (thien van)) cau thuc van hanh kem ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. ((hieu ve) OR (thien van)) cau thuc van hanh kem ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. ((hieu ve) or (thien van)) cau thuc van hanh kem ((cua tre) or (cuu tre))*.