Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
vat thanh » dat thanh, gat thanh, tat thanh
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, dua tren
ma hoi » mai hoi, xa hoi, ma hoa
va am » va lam, va cam
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: toc sach ky nang ma hoi. hieu va am thuc vat thanh doi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ma hoi. hieu va am thuc vat thanh doi ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ma hoi. hieu va am thuc vat thanh doi ((cua tre) or (cua triet))*.