Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cach tu » cach thuc
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
cac tu » cac thu, cac du, tac tu
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 va ((cac tu) OR (cach tu)) va hanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x hoi. hieu va ((cac tu) OR (cach tu)) va hanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. hieu va ((cac tu) OR (cach tu)) va hanh tai cua tre*.